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From: RayeR <glaux AT centrum DOT cz>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: djgpp compiler and tools, execution of apps on 64-bit windows
Date: Sat, 15 May 2010 05:06:33 -0700 (PDT)
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You just need to install OS that supports 36bit PAE extension, like
Windows 2003 server. See here for more details:
http://en.wikipedia.org/wiki/Physical_Address_Extension. There's a
limitation that every app can see only 32bit space but multiple apps
gets it's own so together they can use more than 4GB.

64bit win doesn't have any native support for 16bit apps, there's just
buil-in virtual PC emulator. Also you can have dual boot with Win7-64
and FreeDOS/Win9X/WinXP.