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I too had some users, not being able to run EXEs compiled with 1.9n-ish version, due to unsupported "legacy" directPlay, even if not used by the EXE.

BTW. did you ever encounter the excessively slow line drawing command issue?, (like here on win10, dx 12, amd radeon R3). I wrote a substitute, but there may be a speed issue with dx7 2D in dx12. 

BTW2 I guess DirectPlay is not really required, as it can be substituted by TCP and UDP. Which I guess is what most people would do in the first place anyway.