I haven't worked with a VUDU box yet, but I just took a quick look in the Add Device Wizard and while using model based setup, I see that the VUDU brandname is in there and if you enter in "VUDU" as a model number, it comes up with a device called the "VUDU Box". Although I haven't tried this myself, it sounds like you don't have to convert any Pronto files to get this to work.

Let us know if this is a resonable solution because I was holding off on offering a VUDU box because I didn't know if I could properly control it.