also if you're wondering why so many files use three letter extensions, like how JPEGs are often .JPG: it's because of MS-DOS. DOS allowed for filenames with a maximum length of 8.3 - that is, eight letters with a three letter extension. so FILENAME.JPG is okay, but FILE_NAME.JPEG is too long on both accounts. everyone just kinda agreed that 3 is a good number for file extensions and here we are still using it for pretty much everything even though it hasn't been required for decades
@lynnesbian And MS-DOS inherited it from CP/M.
And CP/M inherited the three-character extension from DEC (where "6.3" filename formats had been the norm back to the 1960s).
Basically, decisions made about 55 years ago affect how people name things today, even though those technical limitations haven't existed for the average person for almost 25 years.
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