[Yeo Kheng Meng] didn’t cheat by simply running MS-DOS on a modern PC, either: he tested the client ... which was the compiler of choice for most DOS game developers back in the day.

It still has excellent compatibility with MS-DOS software, including Windows 3.1 and earlier, and many of the built-in ...

The Settlers Online combines the popular gameplay elements of The Settlers franchise with brand new features suited to a persistent, web-based browser game.

To get the answer, just put a decimal point in the number "50"—my first Microsoft product was MS-DOS 5.0.