On 2022年03月04日 11:55, Chris Angelico wrote: > In MS-DOS, it was perfectly possible to have spaces in file names DOS didn't allow space (0x20) in filenames unless you hacked it by hex-editing your filesystem (which I may have done a couple times). However it did allow you to use 0xFF in filenames which *appeared* as a space in most character-sets. I may have caused a mild bit of consternation in school computer labs doing this. ;-) > Windows forbade a bunch of characters in file names Both DOS and Windows also had certain reserved filenames https://www.howtogeek.com/fyi/windows-10-still-wont-let-you-use-these-file-names-reserved-in-1974/ that could cause issues if passed to programs. To this day, if you poke around on microsoft.com and change random bits of URLs to include one of those reserved filenames in the GET path, you'll often trigger a 5xx error rather than a 404 that you receive with random jibberish in the same place. https://microsoft.com/…/asdfjkl → 404 https://microsoft.com/…/lpt1 → 5xx https://microsoft.com/…/asdfjkl/some/path → 404 https://microsoft.com/…/lpt1/some/path → 5xx Just in case you aspire to stir up some trouble. -tkc