Precisely what DragonHawk said, Infogrames has no interest in supporting games they didn't have anything to do with. The company that made the game in the first place doesn't exist any longer in the same way it once did. To expect anyone so long afte the game came out to re-code half of it to work under XP is as insane as wondering why the creator's of the original Populous no longer patch it to work on the latest systems!
It's not just a case of the game being old, or having to change the code for reasons that Bill Gates should be shot for (backwards compatability my arse), but expecting the companies to say at the time the game comes out that tech support is going to cover all future operating systems as far as the eye can see is just plain silly.
Sure, boycott Infogrames and don't buy another one of their titles. They won't care, it's been proven time and again, and they publish far too many games to care. They've got such a huge gamer-base buying all of their products that they're not going to give a damn about anyone who say's they're not going to buy their games any more.
That's just not the way to go about it. As DragonHawk says, if you want X-COM to continue, don't take it out on X-COM. If you want to get a point across to Infogrames, get all of these friends of yours together and all send in an email asking for help, once or twice a week every week until you finally get noticed and the monkey at the other end of the email decides to pass it onto their superior rather than give you a stock response again. Hell, if you really do know people who run gaming stores, then you could even have a bit of weight behind your case if you do what I just suggested, but coming into a fansite forum and moaning at us is going to achieve diddly squat. We have less power to do anything than a jellyfish stranded on a beach whilst the tide's going out and there's a group of boys approaching with long sticks and inquisitive looks on their faces... strange but true.
And, not to sound like I'm being oppressive here, but if you say BITE ME to a moderator again, I'll kick your ass off these forums so damn fast you won't even see the door on the way out til it smacks you in the face. If you've got a problem with that, you can either PM (personal message, hint hint) me or alternatively, if you've run out of option, BITE ME instead!
May your terror missions always be infested with Chrysalids.