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German railway seeks IT admin to manage MS-DOS and Windows 3.11 systems
(www.techspot.com)
This is a most excellent place for technology news and articles.
Only MS-DOS 1.25 and 2.0 are open-sourced under MIT license, anything newer is not. These versions were pretty bare-bones, only DOS 2.0 implemented directories for example.
Unless you mean FreeDOS, which is an open-source DOS-based operating system, which generally should work with any DOS programs/games, but it still may not be 100% compatible with some proprietary software.
Yes, meant FreeDOS, and older versions of DOS. Can't say I had issues with FreeDOS. But then again, it's not like I use it daily.