Two possibilities, neither of which seem to bother most UFT/Win2000 WinXP users:
1) Turn off Antivirus software, which can treat multi-disk scripting as a virus. 2)PKZip, which I believe was used to create the UFT sqz files, formerly used some command character (-) or (~) or something (see PKzip WWW site) in Fat16/Fat32 DOS commands that is not recognized the same in WinNT NTFS file system. Should not be a problem with XP if correct compatability mode is chosen.
Note: Although the above problems exist, I have not seen UFT users report them.