windows process cases?

Hi, I have two almost identical machines running windows2000 with the same updates service packs etc

In task manager, one of them has "winlogon.exe" in all lowercase letters, the other has "WINLOGON.EXE" in all uppercase letters

Is this normal? Which is the normal capitalization for this process?

Does the all caps one indicate that process has been replaced by a trojan or something like that? If I make a checksum of each should they be identical?

Any help or advice would be appreciated

Windows XP is just as good if not better than Windows 2000, but Windows 2000 isn't a bad choice just because Windows XP is around.  It's all about which you want to use (or if for some God forsaken reason you need Windows 2000 to do something that can't be done on XP).