Is it possible to view the content of app bundle(.app file)

Is it possible to view the content of compiled app bundle(.开发者_如何学运维app file)? check if the app uses some kind library(.a file)?

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.app file as simply a file wrapper, a folder with a extension.

Assuming you're using Mac OS X, you can view the content of a file wrapper by right clicking on the .app file and selecting "Show Package Contents".