diff --git a/src/SharpCompress/Archives/SevenZip/SevenZipArchive.Factory.cs b/src/SharpCompress/Archives/SevenZip/SevenZipArchive.Factory.cs
index 30adbaf9..67f0a1ff 100644
--- a/src/SharpCompress/Archives/SevenZip/SevenZipArchive.Factory.cs
+++ b/src/SharpCompress/Archives/SevenZip/SevenZipArchive.Factory.cs
@@ -12,11 +12,11 @@ namespace SharpCompress.Archives.SevenZip;
 
 public partial class SevenZipArchive
 #if NET8_0_OR_GREATER
-    : IArchiveOpenable<IArchive, IAsyncArchive>,
-        IMultiArchiveOpenable<IArchive, IAsyncArchive>
+    : IArchiveOpenable<ISevenZipArchive, ISevenZipAsyncArchive>,
+        IMultiArchiveOpenable<ISevenZipArchive, ISevenZipAsyncArchive>
 #endif
 {
-    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+    public static ValueTask<ISevenZipAsyncArchive> OpenAsyncArchive(
         string path,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
@@ -25,17 +25,23 @@ public partial class SevenZipArchive
         cancellationToken.ThrowIfCancellationRequested();
         path.NotNullOrEmpty("path");
         return new(
-            (IAsyncArchive)OpenArchive(new FileInfo(path), readerOptions ?? new ReaderOptions())
+            (ISevenZipAsyncArchive)OpenArchive(
+                new FileInfo(path),
+                readerOptions ?? new ReaderOptions()
+            )
         );
     }
 
-    public static IArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
+    public static ISevenZipArchive OpenArchive(string filePath, ReaderOptions? readerOptions = null)
     {
         filePath.NotNullOrEmpty("filePath");
         return OpenArchive(new FileInfo(filePath), readerOptions ?? new ReaderOptions());
     }
 
-    public static IArchive OpenArchive(FileInfo fileInfo, ReaderOptions? readerOptions = null)
+    public static ISevenZipArchive OpenArchive(
+        FileInfo fileInfo,
+        ReaderOptions? readerOptions = null
+    )
     {
         fileInfo.NotNull(nameof(fileInfo));
         return new SevenZipArchive(
@@ -47,7 +53,7 @@ public partial class SevenZipArchive
         );
     }
 
-    public static IArchive OpenArchive(
+    public static ISevenZipArchive OpenArchive(
         IEnumerable<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null
     )
@@ -63,7 +69,7 @@ public partial class SevenZipArchive
         );
     }
 
-    public static IArchive OpenArchive(
+    public static ISevenZipArchive OpenArchive(
         IEnumerable<Stream> streams,
         ReaderOptions? readerOptions = null
     )
@@ -79,7 +85,7 @@ public partial class SevenZipArchive
         );
     }
 
-    public static IArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
+    public static ISevenZipArchive OpenArchive(Stream stream, ReaderOptions? readerOptions = null)
     {
         stream.NotNull(nameof(stream));
 
@@ -93,44 +99,44 @@ public partial class SevenZipArchive
         );
     }
 
-    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+    public static ValueTask<ISevenZipAsyncArchive> OpenAsyncArchive(
         Stream stream,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return new((IAsyncArchive)OpenArchive(stream, readerOptions));
+        return new((ISevenZipAsyncArchive)OpenArchive(stream, readerOptions));
     }
 
-    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+    public static ValueTask<ISevenZipAsyncArchive> OpenAsyncArchive(
         FileInfo fileInfo,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return new((IAsyncArchive)OpenArchive(fileInfo, readerOptions));
+        return new((ISevenZipAsyncArchive)OpenArchive(fileInfo, readerOptions));
     }
 
-    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+    public static ValueTask<ISevenZipAsyncArchive> OpenAsyncArchive(
         IReadOnlyList<Stream> streams,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return new((IAsyncArchive)OpenArchive(streams, readerOptions));
+        return new((ISevenZipAsyncArchive)OpenArchive(streams, readerOptions));
     }
 
-    public static ValueTask<IAsyncArchive> OpenAsyncArchive(
+    public static ValueTask<ISevenZipAsyncArchive> OpenAsyncArchive(
         IReadOnlyList<FileInfo> fileInfos,
         ReaderOptions? readerOptions = null,
         CancellationToken cancellationToken = default
     )
     {
         cancellationToken.ThrowIfCancellationRequested();
-        return new((IAsyncArchive)OpenArchive(fileInfos, readerOptions));
+        return new((ISevenZipAsyncArchive)OpenArchive(fileInfos, readerOptions));
     }
 
     public static bool IsSevenZipFile(string filePath) => IsSevenZipFile(new FileInfo(filePath));
diff --git a/src/SharpCompress/Factories/ZipFactory.cs b/src/SharpCompress/Factories/ZipFactory.cs
index 6c683a38..d93d14b5 100644
--- a/src/SharpCompress/Factories/ZipFactory.cs
+++ b/src/SharpCompress/Factories/ZipFactory.cs
@@ -206,7 +206,7 @@ public class ZipFactory
     /// <inheritdoc/>
     public IWriter OpenWriter(Stream stream, IWriterOptions writerOptions)
     {
-        ZipWriterOptions zipOptions = writerOptions switch
+        var zipOptions = writerOptions switch
         {
             ZipWriterOptions zwo => zwo,
             WriterOptions wo => new ZipWriterOptions(wo),
diff --git a/src/SharpCompress/Readers/Zip/ZipReader.Factory.cs b/src/SharpCompress/Readers/Zip/ZipReader.Factory.cs
index 4a2b18f8..66d8549b 100644
--- a/src/SharpCompress/Readers/Zip/ZipReader.Factory.cs
+++ b/src/SharpCompress/Readers/Zip/ZipReader.Factory.cs
@@ -1,4 +1,3 @@
-
 using System.Collections.Generic;
 using System.IO;
 using System.Threading;
@@ -12,8 +11,6 @@ public partial class ZipReader
     : IReaderOpenable<IZipReader, IZipAsyncReader>
 #endif
 {
-
-
     /// <summary>
     /// Opens a ZipReader for Non-seeking usage with a single volume
     /// </summary>
diff --git a/src/SharpCompress/Readers/Zip/ZipReader.cs b/src/SharpCompress/Readers/Zip/ZipReader.cs
index 22be2278..969e3b4f 100644
--- a/src/SharpCompress/Readers/Zip/ZipReader.cs
+++ b/src/SharpCompress/Readers/Zip/ZipReader.cs
@@ -37,7 +37,6 @@ public partial class ZipReader : AbstractReader<ZipEntry, ZipVolume>, IZipReader
 
     public override ZipVolume Volume { get; }
 
-
     protected override IEnumerable<ZipEntry> GetEntries(Stream stream)
     {
         foreach (var h in _headerFactory.ReadStreamHeader(stream))
diff --git a/tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs b/tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs
index 09828fcf..534f3cfb 100644
--- a/tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs
+++ b/tests/SharpCompress.Test/SevenZip/SevenZipArchiveTests.cs
@@ -307,7 +307,7 @@ public class SevenZipArchiveTests : ArchiveTests
 
         using var reader = archive.ExtractAllEntries();
 
-        Assert.IsType<ISevenZipReader>(reader);
+        Assert.IsAssignableFrom<ISevenZipReader>(reader);
         SevenZipReader sevenZipReader = (SevenZipReader)reader;
         sevenZipReader.DiagnosticsEnabled = true;