Regenerating 8.3 file names

Hello,

8.3 file names creation was disabled and so we had to enable it using fsutil. Now we need to assign some the 8.3 names to the files which where created until then. I tried to use fsutil file setshortname but it does nothing when the long file name and short name matches, so the file is left without a short name. Moreover, if I use it to change the short name to completely different name, I cannot set it back to the original short name if it matches the long name.

Any ideas how to set the file's short name to the long one (assuming it fits), or different way how to recreate the file names without copying the files elsewhere and back?

Thanks,

Jan