What does this print? 

use Win32;
print Win32::GetOSName(),$/;

[download]

Update: Hmm, looks like it doesn't differentiate between them yet... so you will need to check the build numbers.

In reply to Re: How to determining if I am on .NET versus Windows 2003 by Mr. Muskrat
in thread How to determining if I am on .NET versus Windows 2003 by P0w3rK!d

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