Why do .jpg and .jpeg both exist?
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In early MacOS (pre OSX), there was a 4 letter file type code and a 4 letter creator code. The file type told the app what type of file it was opening and the creator code would tell the OS what app to open when you double clicked on it. I think these codes also told the OS what icon to display. These codes were invisible to most users and part of the ”magic” of the gui. Since the file type codes were 4 letters, it used JPEG not JPG.
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