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NTVDMx64 is an unofficial patch of Microsoft's NTVDM ('''NT''' '''V'''irtual '''D'''OS '''M'''achine) for 64-bit Windows. Created by a person who calls himself Leecher1337, it allows 16-bit DOS applications and games to run on 64-bit Windows. It's source code is partially based on the leaked from Windows NT4 source code. Recent versions of NTVDMx64 allow running 16-bit Windows applications and games on 64-bit Windows<ref>http://www.columbia.edu/~em36/ntvdmx64.html</ref>.