Hi Moon, It's not a dumb question. I personally don't use Realmedia player so haven't had any .rm/.Ram extensions so I can't tell you if it would work or not. Perhaps someone else who knows could.
But here's a link to the VCP developers page, you may find an answer there.
Vista Codec Package Homepage (VCP)
Good luck
To determine if your running 32 or 64 hit WIN+Pause/Break and you'll find some simple info.