I have upgraded to 631 on Win2k and I don't have the problem
you are encountering. Have you scaned the registry for all
the perl.exe entries? I have an entry in:
HKEY_USERS\S-1-5-21-1229272821-1580818891-1957994488-500\Software\Microsoft\Windows\CurrentVersion\Explorer\FileExts\.pl\OpenWithList
that has perl.exe with 'a' as the key.