diff --git a/src/SharpCompress/Archives/Rar/RarArchive.cs b/src/SharpCompress/Archives/Rar/RarArchive.cs
index 2afd20be..a05ad417 100644
--- a/src/SharpCompress/Archives/Rar/RarArchive.cs
+++ b/src/SharpCompress/Archives/Rar/RarArchive.cs
@@ -32,18 +32,22 @@ protected override IEnumerable<RarVolume> LoadVolumes(SourceStream sourceStream)
     {
         sourceStream.LoadAllParts(); //request all streams
         var streams = sourceStream.Streams.ToArray();
+        var i = 0;
         if (streams.Length > 1 && IsRarFile(streams[1], ReaderOptions)) //test part 2 - true = multipart not split
         {
             sourceStream.IsVolumes = true;
             streams[1].Position = 0;
             sourceStream.Position = 0;
 
-            return sourceStream.Streams.Select(a => new StreamRarArchiveVolume(a, ReaderOptions, 0));
-        }
-        else //split mode or single file
-        {
-            return new StreamRarArchiveVolume(sourceStream, ReaderOptions, 0).AsEnumerable();
+            return sourceStream.Streams.Select(a => new StreamRarArchiveVolume(
+                a,
+                ReaderOptions,
+                i++
+            ));
         }
+
+        //split mode or single file
+        return new StreamRarArchiveVolume(sourceStream, ReaderOptions, i++).AsEnumerable();
     }
 
     protected override IReader CreateReaderForSolidExtraction()
diff --git a/tests/SharpCompress.Test/OperatingSystemExtensions.cs b/tests/SharpCompress.Test/OperatingSystemExtensions.cs
index 96fbd6d4..c8ca768e 100644
--- a/tests/SharpCompress.Test/OperatingSystemExtensions.cs
+++ b/tests/SharpCompress.Test/OperatingSystemExtensions.cs
@@ -4,5 +4,8 @@ namespace SharpCompress.Test;
 
 public static class OperatingSystemExtensions
 {
-    public static bool IsWindows(this OperatingSystem os) => os.Platform == PlatformID.Win32NT || os.Platform == PlatformID.Win32Windows || os.Platform == PlatformID.Win32S;
+    public static bool IsWindows(this OperatingSystem os) =>
+        os.Platform == PlatformID.Win32NT
+        || os.Platform == PlatformID.Win32Windows
+        || os.Platform == PlatformID.Win32S;
 }