
If only that were true! In some ways, the situation has become even cloudier, thanks to additional limitations from file-sharing services like Dropbox, OneDrive, and Box. Since then, filename restrictions have loosened to the point where it’s easy to think that they no longer exist.

That was limiting, so when Apple developed the Mac operating system in 1984, it allowed longer names and eliminated the need for an extension, although Mac OS X’s Unix roots meant a return of the filename extension in 2001. Back in the early 1980s, DOS filenames couldn’t be more than 8 characters long with a period and a 3-character extension.
