Since there is no native PC version, you have two roads: the legal paid road (via backwards compatibility) or the technical emulation road.
Instead of chasing a broken dream, consider what you really want. If you want the gore, play Mortal Kombat 9 (which does have a PC port and is often $5 on Steam sales). If you want the DC characters, play Injustice: Gods Among Us (also on PC, often free on Epic Games Store). mortal kombat vs dc universe for pc free
For a free alternative featuring DC characters on PC, check out DC Universe™ Online on Steam fighting game Since there is no native PC version, you
: Another alternative that can run the Xbox 360 version of the title. mortal kombat vs dc universe for pc free