JONESMAC  nevermind. It only accepts avi filetypes for your movies. I downloaded mkvs. I assume this will change in future releases.  
(Version 1.0)

::MILE::  uhm, even with AVIs nothing shows up here...!? how did you manage to add them to the app...???  
(Version 1.0)

JONESMAC  I actually just read it on the website but have not tested it myself.

http://angeman7.free.fr/iWatchTV/help.php?language=en&version=1.0

"Editing episodes

You can edit an episode by double-clicking on it. You can modify its movie and its subtitles by drag & drop. The file extension for the movie has to be avi and the file extension for the subtitles has to be srt. When you drop a file, it is automatically renamed and moved to the ~/Movies/iWatch TV/ folder to be managed by iWatchTV."  
(Version 1.0)

::MILE::  yeah, I read all that as well and tried it in different ways, but so far I haven't managed to add a single movie file to the app...! :(((  
(Version 1.0)

::MILE::  Oh crap, I finally managed to get a file into the app -- this is weirdly complicated, unnecessarily strange even...! I actually have to put in all the data, then choose an empty episode by doubleclicking and then I can finally drag and drop the file on the opening sheet...!?! Jeez...

And even then it doesn't seem to import any additiaonal data from anywhere or do anything useful...?! Maybe I still don't get it but this app seems totally unintuitive and useless to me, sorry... :(((

I guess I just put my hopes up too high...  
(Version 1.0)