The Model 950's remote commands (which are also the ones contained in [Outlaw 1]) are laid out differently and are not compatible with the 990. I've got some files for the 990 here (and in the "Remote Files" link in my sig). It includes a couple different files for the MX-700, and those files are compatible with the MX-800 and MX-850.

The 990 includes discrete power on and off commands. Rather than have two power buttons, Outlaw merged the power on command in with the input commands - any input selection will turn the 990 of if it isn't already. The "Power" button is purely a "power off" command. This is very handy for writing macros (which the MX-800 can do lots of). My MX-700 review has a fairly current copy of my setup, including all the macros I have on the power on, power off, and MAIN device buttons.