I too just purchased a Mitsubishi model WS55807 wide screen RPTV and am trying to do the same thing. I have gone to the Remote Central site and found what are supposed to be discreet codes for the Pronto and cut/pasted them into ORDesktop and down loaded to my palm V. I have not been able to make any of thes work yet. I want to use my Palm V to program a older Marantz RC2000MK II remote. If you or anyone has had success I would appreciate a copy of the codes that you find to work. Thanks;