can not run notepad from commandprompt without extension

We have three servers running windows 2003 sp1 none of which can run notepad from the commandprompt unless I type in "notepad.exe"  From start | Run it works like a charm.  The problem does not seem to be isolated to Notepad but any executable
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amnhtechAsked:
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powercramCommented:
Very strange.  Two ideas.  1) Eoes it work if you are in %SYSTEMROOT%\system32?  2) In Windows Explorer options are file extensions being hidden (this is probably an long-shot, but you never know.)
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amnhtechAuthor Commented:
Problem solved.  The problem had to do with the PATHEX variable set in the registry.  Once we fixed that things started working as expected.
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Windows Server 2003

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