MSDOS v2.0 is about 52,000 lines of assembler code. Windows is in the order of 40,000,000 lines of mostly C++ code. It is very unlikely that MS would release

MSDOS v2.0 is about 52,000 lines of assembler code. Windows is in the order of 40,000,000 lines of mostly C++ code. It is very unlikely that MS would release intellectual property that is approx 3000 times the size and possibly a several million times the value of MSDOS. Even assuming that they did, it will take developers a long time to come up to speed with understanding the code base sufficiently to make useful changes. In the meantime MS won't be standing still.