diff --git a/SabreTools.Compression/Blast/State.cs b/SabreTools.Compression/Blast/State.cs
index b946c7a..82e2671 100644
--- a/SabreTools.Compression/Blast/State.cs
+++ b/SabreTools.Compression/Blast/State.cs
@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Linq;
 using static SabreTools.Compression.Blast.Constants;
 
 namespace SabreTools.Compression.Blast
@@ -148,7 +147,9 @@ namespace SabreTools.Compression.Blast
         {
             try
             {
-                OutHow.AddRange(Output.Take((int)Next));
+                byte[] next = new byte[Next];
+                Array.Copy(Output, next, next.Length);
+                OutHow.AddRange(next);
                 return true;
             }
             catch
diff --git a/SabreTools.Compression/ExtensionAttribute.cs b/SabreTools.Compression/ExtensionAttribute.cs
new file mode 100644
index 0000000..f7d035b
--- /dev/null
+++ b/SabreTools.Compression/ExtensionAttribute.cs
@@ -0,0 +1,9 @@
+#if NET20
+
+namespace System.Runtime.CompilerServices
+{
+    [AttributeUsage(AttributeTargets.Assembly | AttributeTargets.Class | AttributeTargets.Method)]
+    internal sealed class ExtensionAttribute : Attribute {}
+}
+
+#endif
\ No newline at end of file
diff --git a/SabreTools.Compression/LZ/Decompressor.cs b/SabreTools.Compression/LZ/Decompressor.cs
index a11d599..147f43d 100644
--- a/SabreTools.Compression/LZ/Decompressor.cs
+++ b/SabreTools.Compression/LZ/Decompressor.cs
@@ -1,5 +1,5 @@
+using System;
 using System.IO;
-using System.Linq;
 using System.Text;
 using SabreTools.IO.Extensions;
 using SabreTools.Models.Compression.LZ;
@@ -181,7 +181,8 @@ namespace SabreTools.Compression.LZ
             }
 
             // Initialize the table with all spaces
-            byte[] table = Enumerable.Repeat((byte)' ', LZ_TABLE_SIZE).ToArray();
+            byte[] table = new byte[LZ_TABLE_SIZE];
+            table = Array.ConvertAll(table, b => (byte)' ');
 
             // Build the state
             var state = new State
@@ -247,7 +248,8 @@ namespace SabreTools.Compression.LZ
                     state.RealCurrent = 0;
                     state.ByteType = 0;
                     state.StringLength = 0;
-                    state.Table = Enumerable.Repeat((byte)' ', LZ_TABLE_SIZE).ToArray();
+                    state.Table = new byte[LZ_TABLE_SIZE];
+                    state.Table = Array.ConvertAll(state.Table, b => (byte)' ');
                     state.CurrentTableEntry = 0xFF0;
                 }
 
diff --git a/SabreTools.Compression/MSZIP/DeflateDecompressor.cs b/SabreTools.Compression/MSZIP/DeflateDecompressor.cs
index a6667dc..54583aa 100644
--- a/SabreTools.Compression/MSZIP/DeflateDecompressor.cs
+++ b/SabreTools.Compression/MSZIP/DeflateDecompressor.cs
@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using SabreTools.IO.Streams;
 using SabreTools.Models.Compression.MSZIP;
 using static SabreTools.Models.Compression.MSZIP.Constants;
@@ -316,13 +315,15 @@ namespace SabreTools.Compression.MSZIP
                     if (distance == null)
                         return null;
 
-                    byte[] arr = bytes.Skip(bytes.Count - (int)distance).Take((int)length).ToArray();
+                    byte[] bytesArr = [.. bytes];
+                    byte[] arr = new byte[(int)length];
+                    Array.Copy(bytesArr, bytes.Count - (int)distance, arr, 0, (int)length);
                     bytes.AddRange(arr);
                 }
             }
 
             // Return the decoded array
-            return bytes.ToArray();
+            return [.. bytes];
         }
 
         /// <summary>
diff --git a/SabreTools.Compression/MSZIP/HuffmanDecoder.cs b/SabreTools.Compression/MSZIP/HuffmanDecoder.cs
index 1f954b8..1570102 100644
--- a/SabreTools.Compression/MSZIP/HuffmanDecoder.cs
+++ b/SabreTools.Compression/MSZIP/HuffmanDecoder.cs
@@ -1,6 +1,8 @@
 using System;
 using System.IO;
+#if NET35_OR_GREATER || NETCOREAPP
 using System.Linq;
+#endif
 using SabreTools.IO.Streams;
 
 namespace SabreTools.Compression.MSZIP
@@ -27,7 +29,15 @@ namespace SabreTools.Compression.MSZIP
             HuffmanNode? root = null;
 
             // Determine the value for max_bits
+#if NET20
+            uint max_bits = 0;
+            foreach (uint u in lengths)
+            {
+                max_bits = u > max_bits ? u : max_bits;
+            }
+#else
             uint max_bits = lengths.Max();
+#endif
 
             // Count the number of codes for each code length
             int[] bl_count = new int[max_bits + 1];