This video provides a solution to the "DirectX 3.0 Not Implemented Error" that occurs when trying to run the original Diablo game on Windows 10. This video is intended to apply only to the 1998 CD-ROM Windows 95/98 release of the game, although I don't know if there are any problems with other versions that this might solve as well.
Unofficial Patch:
http://www.strangebytes.com/index.php...