diff --git a/src/SharpCompress/Algorithms/Adler32.cs b/src/SharpCompress/Algorithms/Adler32.cs
index f7ea0eb3..d7645327 100644
--- a/src/SharpCompress/Algorithms/Adler32.cs
+++ b/src/SharpCompress/Algorithms/Adler32.cs
@@ -1,7 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
-#if !NETSTANDARD2_0 && !NETSTANDARD2_1 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
 #define SUPPORTS_RUNTIME_INTRINSICS
 #define SUPPORTS_HOTPATH
 #endif
diff --git a/src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs b/src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs
index b4956592..60c843d6 100644
--- a/src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs
+++ b/src/SharpCompress/Archives/SevenZip/SevenZipArchive.cs
@@ -253,7 +253,7 @@ public partial class SevenZipArchive : AbstractArchive<SevenZipArchiveEntry, Sev
             return Task.CompletedTask;
         }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
         public override ValueTask<int> ReadAsync(
             Memory<byte> buffer,
             CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Common/AsyncBinaryReader.cs b/src/SharpCompress/Common/AsyncBinaryReader.cs
index 99a29786..39e1b719 100644
--- a/src/SharpCompress/Common/AsyncBinaryReader.cs
+++ b/src/SharpCompress/Common/AsyncBinaryReader.cs
@@ -87,7 +87,7 @@ namespace SharpCompress.Common
             }
         }
 
-#if NET6_0_OR_GREATER
+#if NET8_0_OR_GREATER
         public async ValueTask DisposeAsync()
         {
             if (_disposed)
diff --git a/src/SharpCompress/Common/EntryStream.cs b/src/SharpCompress/Common/EntryStream.cs
index 11d0e898..e4de4ca9 100644
--- a/src/SharpCompress/Common/EntryStream.cs
+++ b/src/SharpCompress/Common/EntryStream.cs
@@ -93,7 +93,7 @@ public class EntryStream : Stream, IStreamStack
         _stream.Dispose();
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask DisposeAsync()
     {
         if (_isDisposed)
@@ -171,7 +171,7 @@ public class EntryStream : Stream, IStreamStack
         return read;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Common/Tar/TarReadOnlySubStream.cs b/src/SharpCompress/Common/Tar/TarReadOnlySubStream.cs
index 4e6ddb70..9a91ba9c 100644
--- a/src/SharpCompress/Common/Tar/TarReadOnlySubStream.cs
+++ b/src/SharpCompress/Common/Tar/TarReadOnlySubStream.cs
@@ -66,7 +66,7 @@ internal class TarReadOnlySubStream : SharpCompressStream, IStreamStack
         base.Dispose(disposing);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async System.Threading.Tasks.ValueTask DisposeAsync()
     {
         if (_isDisposed)
@@ -170,7 +170,7 @@ internal class TarReadOnlySubStream : SharpCompressStream, IStreamStack
         return read;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         System.Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs b/src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs
index da37501b..9925c593 100644
--- a/src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs
+++ b/src/SharpCompress/Common/Zip/WinzipAesEncryptionData.cs
@@ -20,7 +20,7 @@ internal class WinzipAesEncryptionData
     {
         _keySize = keySize;
 
-#if NETFRAMEWORK || NETSTANDARD2_0
+#if LEGACY_DOTNET
         var rfc2898 = new Rfc2898DeriveBytes(password, salt, RFC2898_ITERATIONS);
         KeyBytes = rfc2898.GetBytes(KeySizeInBytes);
         IvBytes = rfc2898.GetBytes(KeySizeInBytes);
diff --git a/src/SharpCompress/Compressors/BZip2/BZip2Stream.cs b/src/SharpCompress/Compressors/BZip2/BZip2Stream.cs
index 24547875..519e8db1 100644
--- a/src/SharpCompress/Compressors/BZip2/BZip2Stream.cs
+++ b/src/SharpCompress/Compressors/BZip2/BZip2Stream.cs
@@ -30,6 +30,7 @@ public sealed class BZip2Stream : Stream, IStreamStack
 
     private Stream stream = default!;
     private bool isDisposed;
+    private bool leaveOpen;
 
     private BZip2Stream() { }
 
@@ -42,10 +43,12 @@ public sealed class BZip2Stream : Stream, IStreamStack
     public static BZip2Stream Create(
         Stream stream,
         CompressionMode compressionMode,
-        bool decompressConcatenated
+        bool decompressConcatenated,
+        bool leaveOpen = false
     )
     {
         var bZip2Stream = new BZip2Stream();
+        bZip2Stream.leaveOpen = leaveOpen;
 #if DEBUG_STREAMS
         bZip2Stream.DebugConstruct(typeof(BZip2Stream));
 #endif
@@ -73,10 +76,12 @@ public sealed class BZip2Stream : Stream, IStreamStack
         Stream stream,
         CompressionMode compressionMode,
         bool decompressConcatenated,
+        bool leaveOpen = false,
         CancellationToken cancellationToken = default
     )
     {
         var bZip2Stream = new BZip2Stream();
+        bZip2Stream.leaveOpen = leaveOpen;
 #if DEBUG_STREAMS
         bZip2Stream.DebugConstruct(typeof(BZip2Stream));
 #endif
@@ -101,7 +106,7 @@ public sealed class BZip2Stream : Stream, IStreamStack
 
     protected override void Dispose(bool disposing)
     {
-        if (isDisposed)
+        if (isDisposed || leaveOpen)
         {
             return;
         }
@@ -142,7 +147,7 @@ public sealed class BZip2Stream : Stream, IStreamStack
 
     public override void SetLength(long value) => stream.SetLength(value);
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
 
     public override int Read(Span<byte> buffer) => stream.Read(buffer);
 
diff --git a/src/SharpCompress/Compressors/BZip2/CBZip2InputStream.cs b/src/SharpCompress/Compressors/BZip2/CBZip2InputStream.cs
index e304ff7f..adbb17f0 100644
--- a/src/SharpCompress/Compressors/BZip2/CBZip2InputStream.cs
+++ b/src/SharpCompress/Compressors/BZip2/CBZip2InputStream.cs
@@ -168,7 +168,8 @@ internal class CBZip2InputStream : Stream, IStreamStack
         storedCombinedCRC;
     private int computedBlockCRC,
         computedCombinedCRC;
-    private bool decompressConcatenated;
+    private  bool decompressConcatenated;
+    private  bool leaveOpen;
 
     private int i2,
         count,
@@ -184,10 +185,12 @@ internal class CBZip2InputStream : Stream, IStreamStack
 
     private CBZip2InputStream() { }
 
-    public static CBZip2InputStream Create(Stream zStream, bool decompressConcatenated)
+    public static CBZip2InputStream Create(Stream zStream, bool decompressConcatenated,
+        bool leaveOpen = false)
     {
         var cbZip2InputStream = new CBZip2InputStream();
         cbZip2InputStream.decompressConcatenated = decompressConcatenated;
+        cbZip2InputStream.leaveOpen = leaveOpen;
         cbZip2InputStream.ll8 = null;
         cbZip2InputStream.tt = null;
         cbZip2InputStream.BsSetStream(zStream);
@@ -215,7 +218,7 @@ internal class CBZip2InputStream : Stream, IStreamStack
 
     protected override void Dispose(bool disposing)
     {
-        if (isDisposed)
+        if (isDisposed || leaveOpen)
         {
             return;
         }
@@ -224,7 +227,7 @@ internal class CBZip2InputStream : Stream, IStreamStack
         this.DebugDispose(typeof(CBZip2InputStream));
 #endif
         base.Dispose(disposing);
-        bsStream?.Dispose();
+            bsStream?.Dispose();    
     }
 
     internal static int[][] InitIntArray(int n1, int n2)
@@ -580,7 +583,10 @@ internal class CBZip2InputStream : Stream, IStreamStack
 
     private void BsFinishedWithStream()
     {
-        bsStream?.Dispose();
+        if (!leaveOpen)
+        {
+            bsStream?.Dispose();
+        }
         bsStream = null;
     }
 
diff --git a/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs b/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
index 7ee38b81..e0500adc 100644
--- a/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
+++ b/src/SharpCompress/Compressors/BZip2/CBZip2OutputStream.cs
@@ -341,12 +341,14 @@ internal sealed class CBZip2OutputStream : Stream, IStreamStack
 
     private int currentChar = -1;
     private int runLength;
+    private readonly bool leaveOpen;
 
-    public CBZip2OutputStream(Stream inStream)
-        : this(inStream, 9) { }
+    public CBZip2OutputStream(Stream inStream, bool leaveOpen = false)
+        : this(inStream, 9, leaveOpen) { }
 
-    public CBZip2OutputStream(Stream inStream, int inBlockSize)
+    public CBZip2OutputStream(Stream inStream, int inBlockSize, bool leaveOpen = false)
     {
+        this.leaveOpen = leaveOpen;
         block = null;
         quadrant = null;
         zptr = null;
@@ -481,7 +483,10 @@ internal sealed class CBZip2OutputStream : Stream, IStreamStack
             this.DebugDispose(typeof(CBZip2OutputStream));
 #endif
             Dispose();
-            bsStream?.Dispose();
+            if (!leaveOpen)
+            {
+                bsStream?.Dispose();
+            }
             bsStream = null;
         }
     }
diff --git a/src/SharpCompress/Compressors/Deflate/DeflateStream.cs b/src/SharpCompress/Compressors/Deflate/DeflateStream.cs
index c045c396..1f41a240 100644
--- a/src/SharpCompress/Compressors/Deflate/DeflateStream.cs
+++ b/src/SharpCompress/Compressors/Deflate/DeflateStream.cs
@@ -366,7 +366,7 @@ public class DeflateStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -457,7 +457,7 @@ public class DeflateStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Deflate/GZipStream.cs b/src/SharpCompress/Compressors/Deflate/GZipStream.cs
index d9af4284..aceacb28 100644
--- a/src/SharpCompress/Compressors/Deflate/GZipStream.cs
+++ b/src/SharpCompress/Compressors/Deflate/GZipStream.cs
@@ -345,7 +345,7 @@ public class GZipStream : Stream, IStreamStack
         return n;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -454,7 +454,7 @@ public class GZipStream : Stream, IStreamStack
         await BaseStream.WriteAsync(buffer, offset, count, cancellationToken).ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Deflate/ZlibBaseStream.cs b/src/SharpCompress/Compressors/Deflate/ZlibBaseStream.cs
index d3c10f9b..dd6590b7 100644
--- a/src/SharpCompress/Compressors/Deflate/ZlibBaseStream.cs
+++ b/src/SharpCompress/Compressors/Deflate/ZlibBaseStream.cs
@@ -552,7 +552,7 @@ internal class ZlibBaseStream : Stream, IStreamStack
         }
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask DisposeAsync()
     {
         if (isDisposed)
@@ -1171,7 +1171,7 @@ internal class ZlibBaseStream : Stream, IStreamStack
         return rc;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Deflate/ZlibConstants.cs b/src/SharpCompress/Compressors/Deflate/ZlibConstants.cs
index ec415d9c..7bf8a3f6 100644
--- a/src/SharpCompress/Compressors/Deflate/ZlibConstants.cs
+++ b/src/SharpCompress/Compressors/Deflate/ZlibConstants.cs
@@ -108,13 +108,9 @@ internal static class ZlibConstants
     public const int Z_BUF_ERROR = -5;
 
     /// <summary>
-    /// The size of the working buffer used in the ZlibCodec class. Defaults to 8192 bytes.
+    /// The size of the working buffer used in the ZlibCodec class. Defaults to 16384 bytes.
     /// </summary>
-#if NETCF
-    public const int WorkingBufferSizeDefault = 8192;
-#else
     public const int WorkingBufferSizeDefault = 16384;
-#endif
 
     /// <summary>
     /// The minimum size of the working buffer used in the ZlibCodec class.  Currently it is 128 bytes.
diff --git a/src/SharpCompress/Compressors/Deflate/ZlibStream.cs b/src/SharpCompress/Compressors/Deflate/ZlibStream.cs
index 3365832c..d94ca210 100644
--- a/src/SharpCompress/Compressors/Deflate/ZlibStream.cs
+++ b/src/SharpCompress/Compressors/Deflate/ZlibStream.cs
@@ -277,7 +277,7 @@ public class ZlibStream : Stream, IStreamStack
         await _baseStream.FlushAsync(cancellationToken).ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask DisposeAsync()
     {
         if (_disposed)
@@ -347,7 +347,7 @@ public class ZlibStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -431,7 +431,7 @@ public class ZlibStream : Stream, IStreamStack
             .ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask WriteAsync(
         ReadOnlyMemory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Deflate64/Deflate64Stream.cs b/src/SharpCompress/Compressors/Deflate64/Deflate64Stream.cs
index 3ba9e618..083f0380 100644
--- a/src/SharpCompress/Compressors/Deflate64/Deflate64Stream.cs
+++ b/src/SharpCompress/Compressors/Deflate64/Deflate64Stream.cs
@@ -200,7 +200,7 @@ public sealed class Deflate64Stream : Stream, IStreamStack
         return count - remainingCount;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/LZMA/LZipStream.cs b/src/SharpCompress/Compressors/LZMA/LZipStream.cs
index eb7fd29b..a7e2d572 100644
--- a/src/SharpCompress/Compressors/LZMA/LZipStream.cs
+++ b/src/SharpCompress/Compressors/LZMA/LZipStream.cs
@@ -46,11 +46,13 @@ public sealed class LZipStream : Stream, IStreamStack
 
     private long _writeCount;
     private readonly Stream? _originalStream;
+    private readonly bool _leaveOpen;
 
-    public LZipStream(Stream stream, CompressionMode mode)
+    public LZipStream(Stream stream, CompressionMode mode, bool leaveOpen = false)
     {
         Mode = mode;
         _originalStream = stream;
+        _leaveOpen = leaveOpen;
 
         if (mode == CompressionMode.Decompress)
         {
@@ -60,7 +62,7 @@ public sealed class LZipStream : Stream, IStreamStack
                 throw new InvalidFormatException("Not an LZip stream");
             }
             var properties = GetProperties(dSize);
-            _stream = new LzmaStream(properties, stream);
+            _stream = new LzmaStream(properties, stream, leaveOpen: leaveOpen);
         }
         else
         {
@@ -127,7 +129,7 @@ public sealed class LZipStream : Stream, IStreamStack
         {
             Finish();
             _stream.Dispose();
-            if (Mode == CompressionMode.Compress)
+            if (Mode == CompressionMode.Compress && !_leaveOpen)
             {
                 _originalStream?.Dispose();
             }
@@ -163,7 +165,7 @@ public sealed class LZipStream : Stream, IStreamStack
 
     public override void SetLength(long value) => throw new NotImplementedException();
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
 
     public override ValueTask<int> ReadAsync(
         Memory<byte> buffer,
diff --git a/src/SharpCompress/Compressors/LZMA/LzmaDecoder.cs b/src/SharpCompress/Compressors/LZMA/LzmaDecoder.cs
index 95d3d027..0fb39626 100644
--- a/src/SharpCompress/Compressors/LZMA/LzmaDecoder.cs
+++ b/src/SharpCompress/Compressors/LZMA/LzmaDecoder.cs
@@ -201,7 +201,7 @@ public class Decoder : ICoder, ISetDecoderProperties // ,System.IO.Stream
         }
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     [MemberNotNull(nameof(_outWindow))]
 #endif
     private void CreateDictionary()
diff --git a/src/SharpCompress/Compressors/LZMA/LzmaStream.cs b/src/SharpCompress/Compressors/LZMA/LzmaStream.cs
index 26079966..2ddfdd8c 100644
--- a/src/SharpCompress/Compressors/LZMA/LzmaStream.cs
+++ b/src/SharpCompress/Compressors/LZMA/LzmaStream.cs
@@ -35,6 +35,7 @@ public class LzmaStream : Stream, IStreamStack
     private readonly Stream _inputStream;
     private readonly long _inputSize;
     private readonly long _outputSize;
+    private readonly bool _leaveOpen;
 
     private readonly int _dictionarySize;
     private readonly OutWindow _outWindow = new();
@@ -56,14 +57,28 @@ public class LzmaStream : Stream, IStreamStack
     private readonly Encoder _encoder;
     private bool _isDisposed;
 
-    public LzmaStream(byte[] properties, Stream inputStream)
-        : this(properties, inputStream, -1, -1, null, properties.Length < 5) { }
+    public LzmaStream(byte[] properties, Stream inputStream, bool leaveOpen = false)
+        : this(properties, inputStream, -1, -1, null, properties.Length < 5, leaveOpen) { }
 
-    public LzmaStream(byte[] properties, Stream inputStream, long inputSize)
-        : this(properties, inputStream, inputSize, -1, null, properties.Length < 5) { }
+    public LzmaStream(byte[] properties, Stream inputStream, long inputSize, bool leaveOpen = false)
+        : this(properties, inputStream, inputSize, -1, null, properties.Length < 5, leaveOpen) { }
 
-    public LzmaStream(byte[] properties, Stream inputStream, long inputSize, long outputSize)
-        : this(properties, inputStream, inputSize, outputSize, null, properties.Length < 5) { }
+    public LzmaStream(
+        byte[] properties,
+        Stream inputStream,
+        long inputSize,
+        long outputSize,
+        bool leaveOpen = false
+    )
+        : this(
+            properties,
+            inputStream,
+            inputSize,
+            outputSize,
+            null,
+            properties.Length < 5,
+            leaveOpen
+        ) { }
 
     public LzmaStream(
         byte[] properties,
@@ -71,13 +86,15 @@ public class LzmaStream : Stream, IStreamStack
         long inputSize,
         long outputSize,
         Stream presetDictionary,
-        bool isLzma2
+        bool isLzma2,
+        bool leaveOpen = false
     )
     {
         _inputStream = inputStream;
         _inputSize = inputSize;
         _outputSize = outputSize;
         _isLzma2 = isLzma2;
+        _leaveOpen = leaveOpen;
 
 #if DEBUG_STREAMS
         this.DebugConstruct(typeof(LzmaStream));
@@ -179,7 +196,10 @@ public class LzmaStream : Stream, IStreamStack
             {
                 _position = _encoder.Code(null, true);
             }
-            _inputStream?.Dispose();
+            if (!_leaveOpen)
+            {
+                _inputStream?.Dispose();
+            }
             _outWindow.Dispose();
         }
         base.Dispose(disposing);
@@ -632,7 +652,7 @@ public class LzmaStream : Stream, IStreamStack
         return total;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs b/src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs
index 8d1a0a5e..ebf9202c 100644
--- a/src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs
+++ b/src/SharpCompress/Compressors/Rar/MultiVolumeReadOnlyStream.cs
@@ -188,7 +188,7 @@ internal sealed class MultiVolumeReadOnlyStream : MultiVolumeReadOnlyStreamBase,
         return totalRead;
     }
 
-#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+#if !LEGACY_DOTNET
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Rar/RarBLAKE2spStream.cs b/src/SharpCompress/Compressors/Rar/RarBLAKE2spStream.cs
index adc1c6f3..57be3533 100644
--- a/src/SharpCompress/Compressors/Rar/RarBLAKE2spStream.cs
+++ b/src/SharpCompress/Compressors/Rar/RarBLAKE2spStream.cs
@@ -385,7 +385,7 @@ internal class RarBLAKE2spStream : RarStream, IStreamStack
         return result;
     }
 
-#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+#if !LEGACY_DOTNET
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Rar/RarCrcStream.cs b/src/SharpCompress/Compressors/Rar/RarCrcStream.cs
index 75a1381e..00753d05 100644
--- a/src/SharpCompress/Compressors/Rar/RarCrcStream.cs
+++ b/src/SharpCompress/Compressors/Rar/RarCrcStream.cs
@@ -129,7 +129,7 @@ internal class RarCrcStream : RarStream, IStreamStack
         return result;
     }
 
-#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+#if !LEGACY_DOTNET
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/Rar/RarStream.cs b/src/SharpCompress/Compressors/Rar/RarStream.cs
index 21c225c3..34700edf 100644
--- a/src/SharpCompress/Compressors/Rar/RarStream.cs
+++ b/src/SharpCompress/Compressors/Rar/RarStream.cs
@@ -189,7 +189,7 @@ internal class RarStream : Stream, IStreamStack
         return outTotal;
     }
 
-#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
+#if !LEGACY_DOTNET
     public override async System.Threading.Tasks.ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         System.Threading.CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/Compressors/ZStandard/CompressionStream.cs b/src/SharpCompress/Compressors/ZStandard/CompressionStream.cs
index af8865b4..df4b4d68 100644
--- a/src/SharpCompress/Compressors/ZStandard/CompressionStream.cs
+++ b/src/SharpCompress/Compressors/ZStandard/CompressionStream.cs
@@ -74,7 +74,7 @@ public class CompressionStream : Stream
 
     ~CompressionStream() => Dispose(false);
 
-#if !NETSTANDARD2_0 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
     public override async ValueTask DisposeAsync()
 #else
     public async ValueTask DisposeAsync()
@@ -145,7 +145,7 @@ public class CompressionStream : Stream
     public override void Write(byte[] buffer, int offset, int count) =>
         Write(new ReadOnlySpan<byte>(buffer, offset, count));
 
-#if !NETSTANDARD2_0 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
     public override void Write(ReadOnlySpan<byte> buffer) =>
         WriteInternal(buffer, ZSTD_EndDirective.ZSTD_e_continue);
 #else
@@ -176,7 +176,7 @@ public class CompressionStream : Stream
         );
     }
 
-#if !NETSTANDARD2_0 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
     private async ValueTask WriteInternalAsync(
         ReadOnlyMemory<byte>? buffer,
         ZSTD_EndDirective directive,
@@ -218,7 +218,7 @@ public class CompressionStream : Stream
         );
     }
 
-#if !NETSTANDARD2_0 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
 
     public override Task WriteAsync(
         byte[] buffer,
diff --git a/src/SharpCompress/Compressors/ZStandard/DecompressionStream.cs b/src/SharpCompress/Compressors/ZStandard/DecompressionStream.cs
index 78af4351..c1aed766 100644
--- a/src/SharpCompress/Compressors/ZStandard/DecompressionStream.cs
+++ b/src/SharpCompress/Compressors/ZStandard/DecompressionStream.cs
@@ -105,7 +105,7 @@ public class DecompressionStream : Stream
     public override int Read(byte[] buffer, int offset, int count) =>
         Read(new Span<byte>(buffer, offset, count));
 
-#if !NETSTANDARD2_0 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
     public override int Read(Span<byte> buffer)
 #else
     public int Read(Span<byte> buffer)
@@ -158,7 +158,7 @@ public class DecompressionStream : Stream
         }
     }
 
-#if !NETSTANDARD2_0 && !NETFRAMEWORK
+#if !LEGACY_DOTNET
     public override Task<int> ReadAsync(
         byte[] buffer,
         int offset,
@@ -276,7 +276,7 @@ public class DecompressionStream : Stream
             throw new ObjectDisposedException(nameof(DecompressionStream));
     }
 
-#if NETSTANDARD2_0 || NETFRAMEWORK
+#if LEGACY_DOTNET
     public virtual Task DisposeAsync()
     {
         try
diff --git a/src/SharpCompress/Compressors/ZStandard/UnsafeHelper.cs b/src/SharpCompress/Compressors/ZStandard/UnsafeHelper.cs
index b145099b..a73023c4 100644
--- a/src/SharpCompress/Compressors/ZStandard/UnsafeHelper.cs
+++ b/src/SharpCompress/Compressors/ZStandard/UnsafeHelper.cs
@@ -16,7 +16,7 @@ public static unsafe class UnsafeHelper
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void* malloc(ulong size)
     {
-#if NET6_0_OR_GREATER
+#if NET8_0_OR_GREATER
         var ptr = NativeMemory.Alloc((nuint)size);
 #else
         var ptr = (void*)Marshal.AllocHGlobal((nint)size);
@@ -31,7 +31,7 @@ public static unsafe class UnsafeHelper
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void* calloc(ulong num, ulong size)
     {
-#if NET6_0_OR_GREATER
+#if NET8_0_OR_GREATER
         return NativeMemory.AllocZeroed((nuint)num, (nuint)size);
 #else
         var total = num * size;
@@ -53,7 +53,7 @@ public static unsafe class UnsafeHelper
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static void free(void* ptr)
     {
-#if NET6_0_OR_GREATER
+#if NET8_0_OR_GREATER
         NativeMemory.Free(ptr);
 #else
         Marshal.FreeHGlobal((IntPtr)ptr);
diff --git a/src/SharpCompress/Crypto/Crc32Stream.cs b/src/SharpCompress/Crypto/Crc32Stream.cs
index dfbcfac8..0dbcce8c 100644
--- a/src/SharpCompress/Crypto/Crc32Stream.cs
+++ b/src/SharpCompress/Crypto/Crc32Stream.cs
@@ -70,7 +70,7 @@ public sealed class Crc32Stream : Stream, IStreamStack
 
     public override void SetLength(long value) => throw new NotSupportedException();
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
 
     public override void Write(ReadOnlySpan<byte> buffer)
     {
diff --git a/src/SharpCompress/IO/BufferedSubStream.cs b/src/SharpCompress/IO/BufferedSubStream.cs
index 747c9776..7a51bb0f 100755
--- a/src/SharpCompress/IO/BufferedSubStream.cs
+++ b/src/SharpCompress/IO/BufferedSubStream.cs
@@ -154,7 +154,7 @@ internal class BufferedSubStream : SharpCompressStream, IStreamStack
         return count;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/IO/ProgressReportingStream.cs b/src/SharpCompress/IO/ProgressReportingStream.cs
index 5ed02835..efadba41 100644
--- a/src/SharpCompress/IO/ProgressReportingStream.cs
+++ b/src/SharpCompress/IO/ProgressReportingStream.cs
@@ -64,7 +64,7 @@ internal sealed class ProgressReportingStream : Stream
         return bytesRead;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override int Read(Span<byte> buffer)
     {
         var bytesRead = _baseStream.Read(buffer);
@@ -95,7 +95,7 @@ internal sealed class ProgressReportingStream : Stream
         return bytesRead;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
@@ -147,7 +147,7 @@ internal sealed class ProgressReportingStream : Stream
         base.Dispose(disposing);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask DisposeAsync()
     {
         if (!_leaveOpen)
diff --git a/src/SharpCompress/IO/ReadOnlySubStream.cs b/src/SharpCompress/IO/ReadOnlySubStream.cs
index 86ef1645..c9d7d830 100644
--- a/src/SharpCompress/IO/ReadOnlySubStream.cs
+++ b/src/SharpCompress/IO/ReadOnlySubStream.cs
@@ -81,7 +81,7 @@ internal class ReadOnlySubStream : SharpCompressStream, IStreamStack
         return value;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override int Read(Span<byte> buffer)
     {
         var sliceLen = BytesLeftToRead < buffer.Length ? BytesLeftToRead : buffer.Length;
@@ -117,7 +117,7 @@ internal class ReadOnlySubStream : SharpCompressStream, IStreamStack
         return read;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
         CancellationToken cancellationToken = default
diff --git a/src/SharpCompress/IO/SharpCompressStream.cs b/src/SharpCompress/IO/SharpCompressStream.cs
index 8da633d1..bc4cad50 100644
--- a/src/SharpCompress/IO/SharpCompressStream.cs
+++ b/src/SharpCompress/IO/SharpCompressStream.cs
@@ -384,7 +384,7 @@ public class SharpCompressStream : Stream, IStreamStack
         await Stream.FlushAsync(cancellationToken).ConfigureAwait(false);
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
 
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
diff --git a/src/SharpCompress/IO/SourceStream.cs b/src/SharpCompress/IO/SourceStream.cs
index 0712d915..e9cc74a6 100644
--- a/src/SharpCompress/IO/SourceStream.cs
+++ b/src/SharpCompress/IO/SourceStream.cs
@@ -289,7 +289,7 @@ public class SourceStream : Stream, IStreamStack
         return total - count;
     }
 
-#if !NETFRAMEWORK && !NETSTANDARD2_0
+#if !LEGACY_DOTNET
 
     public override async ValueTask<int> ReadAsync(
         Memory<byte> buffer,
diff --git a/src/SharpCompress/NotNullExtensions.cs b/src/SharpCompress/NotNullExtensions.cs
index 4fdd355c..0f5ba99c 100644
--- a/src/SharpCompress/NotNullExtensions.cs
+++ b/src/SharpCompress/NotNullExtensions.cs
@@ -21,7 +21,7 @@ internal static class NotNullExtensions
         return source.AsEnumerable();
     }
 
-#if NETFRAMEWORK || NETSTANDARD
+#if LEGACY_DOTNET
     [MethodImpl(MethodImplOptions.AggressiveInlining)]
     public static T NotNull<T>(this T? obj, string? message = null)
         where T : class
diff --git a/src/SharpCompress/Polyfills/StringExtensions.cs b/src/SharpCompress/Polyfills/StringExtensions.cs
index 57d1e1bc..c83dee70 100644
--- a/src/SharpCompress/Polyfills/StringExtensions.cs
+++ b/src/SharpCompress/Polyfills/StringExtensions.cs
@@ -1,4 +1,4 @@
-#if NETFRAMEWORK || NETSTANDARD2_0
+#if LEGACY_DOTNET
 
 namespace SharpCompress;
 
diff --git a/src/SharpCompress/Readers/AbstractReader.cs b/src/SharpCompress/Readers/AbstractReader.cs
index bed01bd5..31423765 100644
--- a/src/SharpCompress/Readers/AbstractReader.cs
+++ b/src/SharpCompress/Readers/AbstractReader.cs
@@ -279,7 +279,7 @@ public abstract class AbstractReader<TEntry, TVolume> : IReader, IAsyncReader
             }
         }
         //don't know the size so we have to try to decompress to skip
-#if NETFRAMEWORK || NETSTANDARD2_0
+#if LEGACY_DOTNET
         using var s = await OpenEntryStreamAsync(cancellationToken).ConfigureAwait(false);
         await s.SkipEntryAsync(cancellationToken).ConfigureAwait(false);
 #else
@@ -346,7 +346,7 @@ public abstract class AbstractReader<TEntry, TVolume> : IReader, IAsyncReader
 
     internal async ValueTask WriteAsync(Stream writeStream, CancellationToken cancellationToken)
     {
-#if NETFRAMEWORK || NETSTANDARD2_0
+#if LEGACY_DOTNET
         using Stream s = await OpenEntryStreamAsync(cancellationToken).ConfigureAwait(false);
         var sourceStream = WrapWithProgress(s, Entry);
         await sourceStream.CopyToAsync(writeStream, 81920, cancellationToken).ConfigureAwait(false);
diff --git a/src/SharpCompress/SharpCompress.csproj b/src/SharpCompress/SharpCompress.csproj
index a48b0b7a..2e9f4056 100644
--- a/src/SharpCompress/SharpCompress.csproj
+++ b/src/SharpCompress/SharpCompress.csproj
@@ -28,6 +28,9 @@
     <EmbedUntrackedSources>true</EmbedUntrackedSources>
     <AllowedOutputExtensionsInPackageBuildOutputFolder>$(AllowedOutputExtensionsInPackageBuildOutputFolder);.pdb</AllowedOutputExtensionsInPackageBuildOutputFolder>
   </PropertyGroup>
+  <PropertyGroup Condition=" '$(TargetFramework)' == 'net48' Or '$(TargetFramework)' == 'netstandard20' ">
+    <DefineConstants>$(DefineConstants);LEGACY_DOTNET</DefineConstants>
+  </PropertyGroup>
   <PropertyGroup Condition=" '$(TargetFramework)' == 'net8.0' Or '$(TargetFramework)' == 'net10.0' ">
     <IsTrimmable>true</IsTrimmable>
   </PropertyGroup>
diff --git a/src/SharpCompress/Utility.cs b/src/SharpCompress/Utility.cs
index 5fd18e6b..5b3ed2dd 100644
--- a/src/SharpCompress/Utility.cs
+++ b/src/SharpCompress/Utility.cs
@@ -189,7 +189,7 @@ internal static class Utility
             }
         }
 
-#if NET60_OR_GREATER
+#if NET8_0_OR_GREATER
         public bool ReadFully(byte[] buffer)
         {
             try
diff --git a/tests/SharpCompress.Test/Streams/DisposalTests.cs b/tests/SharpCompress.Test/Streams/DisposalTests.cs
index 9d30ab76..08995892 100644
--- a/tests/SharpCompress.Test/Streams/DisposalTests.cs
+++ b/tests/SharpCompress.Test/Streams/DisposalTests.cs
@@ -2,6 +2,7 @@ using System;
 using System.IO;
 using SharpCompress.Common;
 using SharpCompress.Compressors;
+using SharpCompress.Compressors.BZip2;
 using SharpCompress.Compressors.Deflate;
 using SharpCompress.Compressors.LZMA;
 using SharpCompress.Compressors.Lzw;
@@ -152,9 +153,21 @@ public class DisposalTests
     [Fact]
     public void LZipStream_Disposal()
     {
-        // LZipStream always disposes inner stream
+        // LZipStream now supports leaveOpen parameter
         // Use Compress mode to avoid need for valid input header
-        VerifyAlwaysDispose(stream => new LZipStream(stream, CompressionMode.Compress));
+        VerifyStreamDisposal(
+            (stream, leaveOpen) => new LZipStream(stream, CompressionMode.Compress, leaveOpen)
+        );
+    }
+
+    [Fact]
+    public void BZip2Stream_Disposal()
+    {
+        // BZip2Stream now supports leaveOpen parameter
+        VerifyStreamDisposal(
+            (stream, leaveOpen) =>
+                new BZip2Stream(stream, CompressionMode.Compress, false, leaveOpen)
+        );
     }
 
     [Fact]
diff --git a/tests/SharpCompress.Test/Streams/LeaveOpenBehaviorTests.cs b/tests/SharpCompress.Test/Streams/LeaveOpenBehaviorTests.cs
new file mode 100644
index 00000000..76e0565e
--- /dev/null
+++ b/tests/SharpCompress.Test/Streams/LeaveOpenBehaviorTests.cs
@@ -0,0 +1,226 @@
+using System;
+using System.IO;
+using System.Text;
+using SharpCompress.Compressors;
+using SharpCompress.Compressors.BZip2;
+using SharpCompress.Compressors.LZMA;
+using SharpCompress.Test.Mocks;
+using Xunit;
+
+namespace SharpCompress.Test.Streams;
+
+public class LeaveOpenBehaviorTests
+{
+    private static byte[] CreateTestData() =>
+        Encoding.UTF8.GetBytes("The quick brown fox jumps over the lazy dog");
+
+    [Fact]
+    public void BZip2Stream_Compress_LeaveOpen_False()
+    {
+        using var innerStream = new TestStream(new MemoryStream());
+        using (
+            var bzip2 = new BZip2Stream(
+                innerStream,
+                CompressionMode.Compress,
+                false,
+                leaveOpen: false
+            )
+        )
+        {
+            bzip2.Write(CreateTestData(), 0, CreateTestData().Length);
+            bzip2.Finish();
+        }
+
+        Assert.True(innerStream.IsDisposed, "Inner stream should be disposed when leaveOpen=false");
+    }
+
+    [Fact]
+    public void BZip2Stream_Compress_LeaveOpen_True()
+    {
+        using var innerStream = new TestStream(new MemoryStream());
+        byte[] compressed;
+        using (
+            var bzip2 = new BZip2Stream(
+                innerStream,
+                CompressionMode.Compress,
+                false,
+                leaveOpen: true
+            )
+        )
+        {
+            bzip2.Write(CreateTestData(), 0, CreateTestData().Length);
+            bzip2.Finish();
+        }
+
+        Assert.False(
+            innerStream.IsDisposed,
+            "Inner stream should NOT be disposed when leaveOpen=true"
+        );
+
+        // Should be able to read the compressed data
+        innerStream.Position = 0;
+        compressed = new byte[innerStream.Length];
+        innerStream.Read(compressed, 0, compressed.Length);
+        Assert.True(compressed.Length > 0);
+    }
+
+    [Fact]
+    public void BZip2Stream_Decompress_LeaveOpen_False()
+    {
+        // First compress some data
+        var memStream = new MemoryStream();
+        using (var bzip2 = new BZip2Stream(memStream, CompressionMode.Compress, false, true))
+        {
+            bzip2.Write(CreateTestData(), 0, CreateTestData().Length);
+            bzip2.Finish();
+        }
+
+        memStream.Position = 0;
+        using var innerStream = new TestStream(memStream);
+        var decompressed = new byte[CreateTestData().Length];
+
+        using (
+            var bzip2 = new BZip2Stream(
+                innerStream,
+                CompressionMode.Decompress,
+                false,
+                leaveOpen: false
+            )
+        )
+        {
+            bzip2.Read(decompressed, 0, decompressed.Length);
+        }
+
+        Assert.True(innerStream.IsDisposed, "Inner stream should be disposed when leaveOpen=false");
+        Assert.Equal(CreateTestData(), decompressed);
+    }
+
+    [Fact]
+    public void BZip2Stream_Decompress_LeaveOpen_True()
+    {
+        // First compress some data
+        var memStream = new MemoryStream();
+        using (var bzip2 = new BZip2Stream(memStream, CompressionMode.Compress, false, true))
+        {
+            bzip2.Write(CreateTestData(), 0, CreateTestData().Length);
+            bzip2.Finish();
+        }
+
+        memStream.Position = 0;
+        using var innerStream = new TestStream(memStream);
+        var decompressed = new byte[CreateTestData().Length];
+
+        using (
+            var bzip2 = new BZip2Stream(
+                innerStream,
+                CompressionMode.Decompress,
+                false,
+                leaveOpen: true
+            )
+        )
+        {
+            bzip2.Read(decompressed, 0, decompressed.Length);
+        }
+
+        Assert.False(
+            innerStream.IsDisposed,
+            "Inner stream should NOT be disposed when leaveOpen=true"
+        );
+        Assert.Equal(CreateTestData(), decompressed);
+
+        // Should still be able to use the stream
+        innerStream.Position = 0;
+        Assert.True(innerStream.CanRead);
+    }
+
+    [Fact]
+    public void LZipStream_Compress_LeaveOpen_False()
+    {
+        using var innerStream = new TestStream(new MemoryStream());
+        using (var lzip = new LZipStream(innerStream, CompressionMode.Compress, leaveOpen: false))
+        {
+            lzip.Write(CreateTestData(), 0, CreateTestData().Length);
+            lzip.Finish();
+        }
+
+        Assert.True(innerStream.IsDisposed, "Inner stream should be disposed when leaveOpen=false");
+    }
+
+    [Fact]
+    public void LZipStream_Compress_LeaveOpen_True()
+    {
+        using var innerStream = new TestStream(new MemoryStream());
+        byte[] compressed;
+        using (var lzip = new LZipStream(innerStream, CompressionMode.Compress, leaveOpen: true))
+        {
+            lzip.Write(CreateTestData(), 0, CreateTestData().Length);
+            lzip.Finish();
+        }
+
+        Assert.False(
+            innerStream.IsDisposed,
+            "Inner stream should NOT be disposed when leaveOpen=true"
+        );
+
+        // Should be able to read the compressed data
+        innerStream.Position = 0;
+        compressed = new byte[innerStream.Length];
+        innerStream.Read(compressed, 0, compressed.Length);
+        Assert.True(compressed.Length > 0);
+    }
+
+    [Fact]
+    public void LZipStream_Decompress_LeaveOpen_False()
+    {
+        // First compress some data
+        var memStream = new MemoryStream();
+        using (var lzip = new LZipStream(memStream, CompressionMode.Compress, true))
+        {
+            lzip.Write(CreateTestData(), 0, CreateTestData().Length);
+            lzip.Finish();
+        }
+
+        memStream.Position = 0;
+        using var innerStream = new TestStream(memStream);
+        var decompressed = new byte[CreateTestData().Length];
+
+        using (var lzip = new LZipStream(innerStream, CompressionMode.Decompress, leaveOpen: false))
+        {
+            lzip.Read(decompressed, 0, decompressed.Length);
+        }
+
+        Assert.True(innerStream.IsDisposed, "Inner stream should be disposed when leaveOpen=false");
+        Assert.Equal(CreateTestData(), decompressed);
+    }
+
+    [Fact]
+    public void LZipStream_Decompress_LeaveOpen_True()
+    {
+        // First compress some data
+        var memStream = new MemoryStream();
+        using (var lzip = new LZipStream(memStream, CompressionMode.Compress, true))
+        {
+            lzip.Write(CreateTestData(), 0, CreateTestData().Length);
+            lzip.Finish();
+        }
+
+        memStream.Position = 0;
+        using var innerStream = new TestStream(memStream);
+        var decompressed = new byte[CreateTestData().Length];
+
+        using (var lzip = new LZipStream(innerStream, CompressionMode.Decompress, leaveOpen: true))
+        {
+            lzip.Read(decompressed, 0, decompressed.Length);
+        }
+
+        Assert.False(
+            innerStream.IsDisposed,
+            "Inner stream should NOT be disposed when leaveOpen=true"
+        );
+        Assert.Equal(CreateTestData(), decompressed);
+
+        // Should still be able to use the stream
+        innerStream.Position = 0;
+        Assert.True(innerStream.CanRead);
+    }
+}