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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 leaked from Windows NT. 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>. Since NTVDMx64 is very slow and uses non-standard ways to run 16-bit applications and games, it is recommended to use emulators such as [[DOSBox]], [[vDOS]] and [[PCem]], virtualization software such as [[VirtualBox]], [[VMware Workstation Player]] and [[QEMU]] etc. to run 16-bit applications and games on 64-bit Windows.