Eh? I thought $^O worked on Win32 with at least 5.005_3 and up, if not even earlier. It certainly works with 5.6.0.
Incidentally, I don't see the code you mentioned, but I assume it uses Config.pm (ie, $Config{archname}).

if ("Win32" ne  "WinNT")  {
 @Win32 = ("Win95","Win98","Win2000","WinNT");
}

Sorry, the code snippet I refer to is OS.pl, it has just been posted.

Intrepid

Q: What is the sound of several hundred Perler-dogs chasing cool code?
A: YAPC - YAPC - YAPC .. ! :)