[NTVDM] add support of DOS/32 extender

http://download.narechk.net/dos32a-912-src.zip

http://dos32a.narechk.net/index_en.html

http://en.wikipedia.org/wiki/DOS/32

DOS/32 is compatible with MS-DOS 5.00 through 7.10, Windows 3.x, 95, 98 and Me, NT 3.51 and 4.0 (Service Pack 3 or later), 2000, XP and IBM OS/2 as well as OpenDOS and DOSEMU.[3]

DOS/32 has been commercially available since 1996. As of May 2002, it was released to the public in the form of "Liberty Edition" which provides complete source code, allowing unrestricted, royalty-free distribution.[2]