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On my mac, when I go to the folder Applications see the format ".app"
How can I hide it?

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up vote 6 down vote accepted

Right click on finder left panel choose "open sidebar preferences" go to advance tab uncheck the "show all file extension"

enter image description here

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I uncheck the first checkbox but its still show the .api – Daniel May 21 '11 at 20:32
@Daniel, can you post a screenshot of what you have. @Am1rr3zA's answer is correct. But in your question you state .app and in your comment .api I think you are trying to hide file extensions, which is what was answered above. – RobZolkos May 22 '11 at 8:55

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