Extenders are remote specific. This means that if you want to use an extender, the first thing you need to do is to check and see if there is an extender available for your remote. Look in the Extenders folder in the Files section of the JP1 Users Group to see if an extender is available for your remote. In some cases, there may be multiple versions of the extender available. The comments explain what functionality each version provides.
Did you find an Extender for your remote in the Extenders folder?
Yes, I found an Extender for my remote.
No, I did not find an Extender listed for my remote.
Reference Links
http://groups.yahoo.com/group/jp1/files/Extenders - Folder containing the Extenders for the JP1 remotes.