(An almost-copy also emailed to Tubbay)
NT and Win2K sort of got rid of ems/xms, but old DOS programs may still search for it. There are two ways to fool DOS programs into believing they run under the old DOS/xms/ems regime:
1) The Microsoft approach
Delete whatever pif-files you have in the MOO directory.
Right-click on the install.exe file, choose "properties".
Memory tag: Choose EMS and XMS to be 4096K (A good setting for most games. I think Moo only needs ems, but it never hurts to add both. Too large values may make some games behave strange.) Other memory settings should be OK. Do the same for orion.exe.
To remember for most DOS games:
Diverse-tag: Choose idle sensitivity to minimum. Does not do anything for MOO, but some old DOS games run very slow under NT/W2K, this may make them speed up.
Program-tag - Advanced: Be sure that "Compatible timer emulation" is disabled (it usually is). Will also help against unnaturally slow DOS games.
You will now have new pifs (or shortcuts) to the executables.
2) The cool approach
DOS games simply can not do sound under W2K.
So you won't get the nice MOO music. Unless.
Look at
http://www.ece.mcgill.ca/~vromas/vdmsound/
vdmsound lets you emulate almost any kind of sound card under DOS, playing the sound through the default windows sound system. It's mighty cool. It even gives joystick support for old games.
Download the installer file (VDMSound-2.0.4-WinNT-i386.msi) from sourceforge. Install it. I can't guarantee it won't break your system, but I've used it on several W2K systems without flaw, and I've seen no feedback on the forum pages warning about lethal results. And it's open source, so deadly bugs should have been squashed.
There's also a patch for v2.0.4 to be found (update1), but I haven't installed it myself yet.
I'd recommend downloading the vdmsound launchpad beta, too. Works for me, and is way better for tweaking sound card emulation (usually no such tweaking is needed, though).
C.
And boys, this also will work on XP!