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I'm using the Finder Preferences option, but it still won't show the extensions!

  • Do you notice any change with some files when you select or deselect the option? – JoshT Aug 18 '14 at 2:52
  • Well the extensions started showing after a while (I'm not sure if I had to open a new Finder window or not). But either way... its working now. – jrharshath Aug 19 '14 at 21:15
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Most likely the files you are wondering about do not have any extension associated with them. Unlike Windows and many other operating systems Mac OS does not require a file extension and can use meta data stored in the filesystem instead.

More about Resource Fork and File Type/Creator.

After some searching around it appears to be fairly complicated to take information from the meta data and use that to add extension to files.

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