I've had Commandos 2 for quite a while (got it in a combo pack with Deus Ex) but I never really did anything with it. I noticed this thread and figured I'd install it and try to add widescreen support, and I was actually able to do so with a few minutes of futzing around in a hex editor.
You do need a No-CD patch (wasn't one at GCW; look at MG), and you have to change quite a few strings (11 to be exact), but from what I can tell (I have virtually no experience with the game) it seems to work fine. When I first loaded a level the play area seemed to be a bit small, but then when I went to Alt-F4 out of the game, I discovered that the function keys allow you to change viewport configurations, and they mostly seem to scale properly. Fancy that.
Really, I think it's just that the game gives you a fixed viewable area so while the main one was designed to fit 4:3, adding viewports lets you fill the screen and lets you take advantage of the extra real estate (the viewports are Hor+, as you'll see).
Well, any Commandos fans wanna give it a go and tell me what you think?
http://www.widescreengamingforum.com/node/10510
I don't have Commandos 3 so I can't help you out there. I'll see if I can get a demo later and try to cook something up.
Post your Steam ID here, maybe somebody can gift it for you for great justice.. $10 on Steam.