Assembly being the main player since MS DOS was the underlying infrastructure at the time. Since the entire source for old versions of Windows is still closed, we can’t say for certain.
Bill most certainly had the final say so on all of the code, and from what I understand, he looked at every line of code. He either allowed it or rejected it and rewrote it himself.
According to several sources on how Bill was back then, he combed over every line of code with a fine tooth comb.
Small tidbit, it does not look like C++ was used for Windows OS’s until around Windows 95.
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