Yes, they like to do these kind of things in the name of loving open source nowadays. Also open sourced a 40 year old BASIC implementation which can only be good for a Computer Museum display.
MSDOS 6.0 might be interesting. Windows 3.1 too.
MSDOS 6.0 might be interesting. Windows 3.1 too.
And MS-DOS 4.0/4.1, not to be confused with 4.00/4.01, which had multi-tasking features:
[1] https://github.com/microsoft/MS-DOS