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Does the all caps one indicate that process has been replaced by a trojan or something like that?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

>>9
Windows XP is just as good if you're insightful enough to know how to disable all the shitware it comes with so you end up with Windows 2000 with a couple improvements.