Yes, the above software will work on a mx-800 remote. These remotes are old, many found on a ebay will have non-working keys, or the RF circuitry has detached. If you can found one that claims to be new, I'll go with that over used remotes.

You're going to have to get use to button placement, on the pc programmable remotes, the play key is at the bottom of the cursor pad, unlike on the mx-600 being on top.