|> I think it was put back in XP.|
Sigh ... everybody has the right to be wrong sometimes ...
Keep in mind there is something like CHOICE.COM and CHOICE.EXE ... but if you have always coded "CHOICE", and not WITH the extension, you are safe. Don't ever use extensions on OS commands, unless you know what you do.
To the threadstarter ... ROBOCOPY is present in Vista, not in XP.
If you really want to have more details, run these commands on all concerned OS'es, and compare the full output :