Hey,
I'm on OS X, arduino ide 1.6.0.
I saw some code and wanted to check on the Wire library but it's not in the
Arduino package/Contents/Resources/Java/libraries
and not in the custom
Documents/Arduino/libraries
The ide sees it and it works fine but I can't find it.
yeah, I opened the package here's an image of the libraries.

As you can see, WIFI is the last library.
Ah, found it. Did a search on the package.
It's stuffed away in
Arduino package/Contents/Resources/Java/hardware/arduino/sam or avr/libraries/Wire
the sam or avr folders answered my question. I'm on a due.
On OS/X the "find" command is handy for things like that.
yeah, brain fart happens.