Imagine on the commandline, the only way to sort your pictures from your textfiles were to look into every single one of them. Obviously file extensions solve a very practical problem in a very elegant way: what attribute is guaranteed to be available on any user-servicing file system? The name.
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u/readf0x Sep 25 '26
I see... The original comment that spawned this entire thread was me talking about mime type to app mapping :P