Thanks...I don't have the knowledge to use this file to solve my problem...I'm just a homeowner who didn't know any better when I purchased the MX-850 from HiDefseveral years ago. I was able to get it to do everything I needed up until now where I have run into the current problem. I was hoping I could locate a .mxf config file that I could directly download to the MX-850 using the editor I received with the remote.