I ran my program under Windows 98 and during the install I get the error
"A required .DLL file msvbvm60.dll was not found". Now I have to add this file to my users Windows\system32 folder.

You said and I quote "If you plan to deploy to unsupported versions of Windows (XP SP2 or anything earlier) you should include all of these files."

I want to target 'supported versions' of Windows (XP SP2 and later) so I don't get error messages during setup, so if my user has XP SP1, they will get the error above regarding "A required .DLL file msvbvm60.dll was not found" if they don't have this file.

I only want to cover Windows XP/Vista/7....however the XP SP1 is under windows XP. Otherwise, I could only include VB6STKIT.DLL during the bootstrap sequence and all the other bootstrap files will be preinstalled.