[CupOfCheese]

I can't seem to program the following keys on my WMC remote to work with Kodi:

Guide, display, and record are the big ones. Is there any way to manually map these? When I use the show key tool, nothing comes up.

[Fail$tyle420]

Are you sure your computer is receiving the remote's commands??

[Atreyu]

First make sure your machine is able to receive commands.
Then, you could use the Kodi keymapper addon, which is very easy to use.