I might use .txt and .doc.. Since I can add tables to .doc and all the info can still stay intact in .txt.
Most people should be able to read .txt.
The reason I ask is I'm adding something special to my next set of projects. (Evil grin)
I didn't know what formats Unix, Lunix, OSx, or any of them used other then Windows. I haven't messed with the mac version since High school when I repaired them. Even though there isn't really anything to repair, it's just replacing boards.