There are also ported versions of modern utilities, like Vim and Curl, and there is built-in support for FAT32 file systems. That last feature was never in the public releases of MS-DOS ...

Rebranded as MS-DOS, the first version appeared in late 1981 and version 1.25 was out about a year later. While you might not think having MS-DOS source code is a big deal, there’s still a lot ...

This isn't the first time Microsoft has open-sourced MS-DOS, as its GitHub repository already has versions 1.25 and 2.0, which were originally shared at the Computer History Museum back in 2014.

It’s interesting that they would preserve what’s arguably the least popular version of MS-DOS in this way, but then again there’s something to be said for having a historical record on what ...