Hi there,
I've been experimenting with all WC titles in Windows 7 the past few days, and here's my report.
System Specs (before anyone asks...):
CPU: Intel Q9300 Core 2 Quad
OS: Windows 7 Ultimate 64bit RC
Video Card: GeForce 9800 GTX
Video Driver: NVIDIA 186.18 64bit Win7 and Vista
RAM: 8GB
Soundcard: my trusty ol' Soundblaster Audigy 2

Video codecs installed: K-Lite Mega Codec Pack 4.9.0.
WC1 incl. SM 1 and 2, WC2 including SO 1 and 2 and WC 3 - Kilrathi Saga Version:
absolutely flawless in Win95 compatibility mode, 256 colors, 640x480, visual designs off, desktop themes off - without any patches installed! Even WC3 rund and plays flawlessly.
WC3 in DOSBox:
with a little bit of tweaking, flawless. VERY minor sound skipping every now and then, but almost unnoticeable.
WC4 in DOSBox:
movies and spaceflight work perfectly, no problems at all.
WC4 DVD:
The only one that's still giving me a bit of a headache.
Win95 compatibility mode on.
Movies work perfectly (no mpeg2dec, no AC3Filter, ffdshow/libavcodec from K-Lite codec Pack 4.9.0 handles video and audio just fine). I'm using the 1.0 MCI patch, haven't tried the others because 1.0 worked from the getgo.
In-game spaceflight does show color palette issues, though. Mission introductory text shows normal colors for a second, then turns into a reddish mess. Radar blips show wrong colors (as seen right on the intro "mission", when I agree to battle it out with Maniac, his radar blip turns from white to blue instead of red - in fact, ALL enemies show up either blue or white on my radar). This happens only in fullscreen mode, though. Running WC4 DVD in a window leads to correct colors, but hey, who wants to play this baby in a window?!? ;-)
I tried everything I could think of to counteract the color issues (different compatibility mode, NO compatibility mode, hardware acceleration settings, running the game with a -d parameter, 256 colors, 640x480, visual designs off, desktop themes off, changing desktop color depth, turning all the fancy 21st century stuff in the NVIDIA driver off. and just about all of the above in combination), but to no avail.
So, if anyone can come up with a possible solution, I'd be eternally grateful. I mean it.
WC Prophecy with full enhancement pack (HiRes movies and HiRes patch):
Pretty much flawless, with our without Win95 compatibility mode. HiRes movies work great without any further tweaking (no mpeg2dec, no AC3Filter, ffdshow/libavcodec from K-Lite codec Pack 4.9.0 handles video and audio just fine). Using Zeckensack's Glidewrapper, spaceflight looks great and plays great. A bit of flickering when "switching" from movies to game and back, but nothing serious.
WCSO:
Just like Prophecy (well, without the movies ;-)). No probs.
To sum it up, Win 7 seems to be a good platform for WC in general...
...with only the WC4 DVD issues remaining, well, at least for me.
Any clue, anyone?