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Show all file extensions

Filename extensions are normally hidden in macOS, so the shown filename is shorter.

But imagine you see a file devil.jpg maybe there is a well taken photo in, but the real name is devil.jpg.app and it is a virus.

How to fix it

macOS 10.11 – 14

  1. Choose Finder > Preferences, then click Advanced.
  2. Select or deselect “Show all filename extensions.”