As @[email protected] said in the thread I cross posted this from:

As the readme states, you can’t actually compile the source code. The compilers are lost to time and it’s from a very obscure, proprietary fork of an obscure language. Essentially, this headline should read “Microsoft owns code not even their engineers could comprehend, so they released it for free since they couldn’t possibly make money from it”.

So you may feel some kind of way about this. At the same time I wasn’t going to NOT post it. It’s interesting.