Hi, I am working on my new RPG (MMO Possibly 
) and I was trying to import a .blender and it says it cant convert it to a .FBX or something : / How do I fix this and use the file?
You need to export to as FBX
The following video shows you the full process:
http://cgcookie.com/blender/2011/08/10/creating-an-animated-door-for-unity-3d-part-01/