on mac archiving utility that comes in what

Ipa want to unzip a file, right-click, did not find "Archive Utility", the file in which directory search did not search ...
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In / System / Library / CoreServices in
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Upstairs is the path to
Supplementary
ipa file, right
Click Show Package contents without the need to extract,
Then simply, directly change the suffix is ​​it, this ability is a folder, windows point to understand

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On the second floor right. Thanks!
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If you can look in the windows to see, but after entering the MAC can not change the windows inside the disk I know something but do not see where that folder ah ah ~