There might be better examples as that could be rewritten to use an open-source library such as InfoZip. Or simply stub-out the licensed functions and let the community fill it in. (And with something better, such as 7-zip so we get ZIP, RAR, 7z, tar, etc. folders.)
But I don't doubt there is other code that is not so easily replaced.
Iām not sure such libraries could be rewritten (in a white-box, non-IP-infringing manner) while maintaining the bug-for-bug ABI compatibility that Microsoft (mostly) guarantees their customers.
But I don't doubt there is other code that is not so easily replaced.