Steam – Hide games in friends list

The invites in MtG:DotP don't always pop up for your friends like they're supposed to. However, your friends can still join your game: In the steam friend's list, they need to click the arrow next to your name, then click "join game." They can bring up the friend's list ingame by hitting shift + tab, or simply by minimizing the game (alt + tab) and opening it from Steam.

You can do the same thing to manually invite friends using your friend's list.

Note that joining and inviting to games both work for most multiplayer Steam games, not just Magic the Gathering.

Not all games available on Steam work with newer PCs.

While some old games "just work" on newer OSs, many other games have compatibility issues which make them buggy or unplayable when you don't have the "required" OS. For example, the Space Quest collection has trouble running on Vista/7.

I would say that if a game doesn't state your OS specifically, you should probably check for known compatibility issues before buying it, especially since you mention you're using Win 8.

An alternative would be Good Old Games, which specifically mention a game's compatibility with newer OSs, if you're unsure whether the Steam version is compatible or not, I'd go with them.