[chris_wot]

ReactOS is an effort to rebuild NT from the ground up, definitely not Windows 3.x

An entirely different beast.

[nandhp]

ReactOS has an NTVDM, however, which runs on 64-bit (it does processor emulation, like OP). However, it looks like it doesn't support Windows applications yet:

http://community.reactos.org/index.php/news/years-progress-n...