Removed throw expressions to avoid Microsoft compiler bug.

Duplicati/CommandLine/RecoveryTool/Restore.cs

@@ -449,7 +449,12 @@ namespace Duplicati.CommandLine.RecoveryTool
                 {
                     stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Delete);
                     cf = Library.DynamicLoader.CompressionLoader.GetModule(Path.GetExtension(filename).Trim('.'), stream, Library.Interface.ArchiveMode.Read, m_options);
-                    m_lookup[filename] = cf ?? throw new Exception(string.Format("Unable to decompress {0}, no such compression module {1}", filename, Path.GetExtension(filename).Trim('.')));
+                    if (cf == null)
+                    {
+                        stream.Dispose();
+                        throw new Exception(string.Format("Unable to decompress {0}, no such compression module {1}", filename, Path.GetExtension(filename).Trim('.')));
+                    }
+                    m_lookup[filename] = cf;
                     m_streams[filename] = stream;
                 }
 

Duplicati/Library/Utility/ShaderStream.cs

@@ -33,7 +33,9 @@ namespace Duplicati.Library.Utility
 
         public ShaderStream(System.IO.Stream baseStream, bool keepBaseOpen)
         {
-            this.m_baseStream = baseStream ?? throw new ArgumentNullException(nameof(baseStream));
+            if (baseStream == null)
+                throw new ArgumentNullException(nameof(baseStream));
+            this.m_baseStream = baseStream;
             this.m_keepBaseOpen = keepBaseOpen;
         }
 

Duplicati/Library/Utility/TempFileStream.cs

@@ -49,7 +49,9 @@ namespace Duplicati.Library.Utility
 
         public TempFileStream(TempFile file)
         {
-            m_file = file ?? throw new ArgumentNullException(nameof(file));
+            if (file == null)
+                throw new ArgumentNullException(nameof(file));
+            m_file = file;
             m_stream = System.IO.File.Open(file, FileMode.Create, FileAccess.ReadWrite, FileShare.None);
         }