Paul A.

Thanks for the clues. It seems Vista is confusing my filenames
with 8.3-generated names.
I cannot recreate the problem if the filenames are 9 characters or longer.
The files have tilde+number as part of the name. The source system
creates unique files with tilde+number as part of the name. This is it's
scheme for managing revisions. The files are recently created on
NTFS. To recreate the problem, create these files in a Vista folder.

007419~1.txt
007419~10.txt
007419~2.txt

Actually, if you create the files in Vista, it will complain when you name
the
third file:
-- Do you want to rename "007419.txt" to "007419~10(2).txt"?