If a computer program is older than the OS you're running, will it still work?

I’ve played games on XP that were for Windows 2000 or below and they ran fine. It all depends on the game too.

Usually, yes – although I’ve had a few problems trying to play Riven on XP SP2 and on OSX Tiger/Leopard as well.

Yea as long as you run in Compatibility mode. Just right-click the shortcut that leads to the game—Properties—Compatibility tab then choose to run it in compatibility mode.

Also check the games site for any patches.

XP is a 2000-based OS, so it should work there for sure.

Yes, some tweaking may be involved. As bad a Microsoft is they do a lot to ensure backward compatibility to a degree.