At 11/11/2001 12:07 AM, you wrote:It's the NT file system (NTFS), which generates a unique 8.3 filename to make files with long filenames (LFNs) accessible to DOS and 16-bit Windows apps. In your example, "index.html" and "index~1.htm" are two names for the same file. The file system keeps track of them "transparently".Carl, the one thing I don't understand is why the .bak file Xy4 creates really seems to be a non-expandable "index~1.htm"