Stupid Question I know but I needed a large file sent from work and we could only do it through gmail. since gmail doesn't let you sent zips he renamed it a pdf. Now how the heck do I change it back? just renaming it doesn't work and I can't find the option to force windows to show file extensions.
"Give a man a fire, he's warm for the night. Set a man on fire he's warm for the rest of his life."
-Terry Pratchett
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Click on the 'View' tab in the resulting dialog.
At the bottom of the first page of items is a checkbox 'Hide extensions for known file types.' Uncheck, apply and hit OK.
Voila.
-Terry Pratchett