Owning the full version of Total Annihilation, both expansion packs, and a 1920x1200 monitor I can answer everything:
1) TA seems to support all aspect ratios, 5:4, 4:3, 16:9, 16:10, in fact it seems TA can take anything I can throw at it
2) HUD is always perfectly preserved
3) Intro movie and menus are always 640x480 video output no matter what (that's what my 2405 tells me when I hit the menu button on the monitor) therefore you should enable aspect ratio scaling via monitor or drivers
4) In game WS support is perfect.
Really amazing considering this game came out in 1997.
I've tested and confirmed:
640x480
800x600
1280x960
1600x1200
1280x1024
1280x720
1600x900
1920x1080
1280x800
1440x900
1680x1050
1920x1200
I also have a friend who runs TA at 2048x1536 so that resolution is also confirmed.
I cannot try 2560x1600 but I am positive that it would work.
Also, I ran all of this on WinXP 64-bit on a Dell 2405FPW as well as a 57 inch Toshiba HDTV (don't recall model number). Video card is 7800GTX however TA does not use hardware acceleration so GPU is unimportant. CPU used was AMD64 2.6 GHz and 2GB RAM.
Also note that since TA's performance is entirely based on CPU (and a little bit by RAM), even the fastest modern CPU's encounter slowdown if you are playing a large modded game, once there are thousands of units active in-game.
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