OK, what have i done wrong here?

On that linked page, there is a section for downloads.
The first option is for beta so I ignored that one 'cos I ain't techie enough to know what I'm doing and went for the Full Setup.
I downloaded it onto my PC, did all the usual AV checks and then ran the application. All went well and I can WATCH the film on the PC screen.
If I ever figure out how to convert the film, am I somehow supposed to run the same programme on the n800?
I tried copying the files over to an SD card on the tablet but nothing I have pre-installed on the n800 seems to want to open the file and install the video player.
Ah well.
These things are sent to try us but it's 3:45 am here in UK so I'm off to my bed.
Take care all.
5teve