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I would like to have all applications names displayed without the .app extension in Spotlight or Alfred. Reeder for example is listed as "Reeder", whereas Sparrow is listed as "".

Which setting determines whether the file extension is visible or not in applications like Spotlight and Alfred?

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up vote 3 down vote accepted

I believe that unless you have "Show all filename extensions" checked in Finder's Preferences, the .app extension is hidden by default. If you were to look at Sparrow in Finder, do you see the .app? If so, open the Get Info window for it (Cmd+i while highlighted) and make sure "Hide extension" is checked. You would have to check each app that is showing its extension manually.

Another thing is that if you have more than one of the app, I think it will always show the extension in Spotlight.

If none of that works, you can always try rebuilding your Spotlight index: $ sudo mdutil -E /

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Rebuilding the Spotlight index did the trick. – stijnvn Dec 10 '11 at 18:16

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