I have been trying to figure this out for a while now but cannot seem to figure it out. I keep getting a file system exception. The exception is: An unknown tar format was encountered.Type: Xceed.GZip.GZippedFileFullName: \SEARCH_JoeBlow_2010-11-09 22.23.09.001z.DITU-NOC.PKG.TAR     My code:  public override void ...

Any update? Just spoke with tech support. We are evalating XCeed zip for .net as enterprise standard. Why wouldn't you support the GNU Tar product? It is supported by both PKZip and WinZip.