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If you're using OS X, then it's simple to find.

Control-click (or right click, if you've got a two-button mouse) on FCP, and click on view package contents. Look around in the subsequent folders for a bit, and you should be able to find the file you're looking for.
 
yeah.. its basically just a preference that tells fcp about how fast your processor is, so it doesnt load it down too much.. really not too complex..
 
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