Certain command file operations: dir, del, copy, and move may not operate as expected. NT may be set to operate like Win95 on file name extensions. For example "del *.htm" would delete .htm and .html extensions in Win9X and in NT if its default behaviour has been changed to emulate Win9x behaviour.

Hive: HKEY_LOCAL_MACHINE
Key: SYSTEM\CurrentControlSet\Control\FileSystem\
Name: Win95TruncatedExtensions
Type: REG_DWORD
Value: 0default NT behavior
Value: 1win95-like behavior

Tim Hill's text on command line scripting is outstanding. If you have an extensive background, writing bat files, forget it. Otherwise, get it.