File name extensions

[Marty Knapp]

I'm working on an application (Mac only at the moment) and was wondering 
about file name extensions. I poked around and found web sites that list 
file name extensions, but is there someplace "official" to register or 
search? Or am I free to use whatever I want? I registered a creator code 
with Apple, but don't know what to do from there.

Thanks,
Marty Knapp
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