If you're not familiar with them, have a look at visual studio SLN files. They are exactly what was described. There is more and more being pushed into the msbu

If you're not familiar with them, have a look at visual studio SLN files. They are exactly what was described. There is more and more being pushed into the msbuild files instead (a separate format, that is at least theoretically separate from visual studio) but the weird and underdocumented sln file still exists. And msbuild files are absolutely unreadable XML crap anyway, good luck writing one by hand.