Just let them install DX9.0c. It won't overwrite any files, and if they
don't exist, it adds them. It won't overwrite DX10 files at all, and some
games require some DX9.0c components. This is the simple answer, MS
developers have a much more indepth answer if you need it.
But, it doesn't hurt anything to install DX9.0c.
"JeffR" <JeffR@discussions.microsoft.com> wrote in message
> What to you do when prompted by a computer game to install Direct X 9.0c?
> Will that try and overwrite Direct X 10? Do you just say no to the
> of Direct X 9.0c and if you do - what happens to the overall installation
> your game?
> Someone please help!