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The concept of file extensions really break down when it comes to audio and video files
Honestly anywhere other than windows they start getting a bit funky since most ecosystems don’t actually rely on the filename to determine the file type
It also doesn’t help that so many file types are just a bunch of text files shoved into a zip file wearing a mask. It’s all abstractions all the way down baby!
It would not be fraud to round up the change that’s handed back to a person to the nearest 5¢, plus businesses already factor in far more than 0-4¢ per transaction for credit card fees, so an added cost of 0-4¢ per cash transaction with the bonus of increased efficiency by having fewer coins to count and track makes it a very easy change to make