You should not modify that value. Actually, it's a good idea for you to learn what payloads are (the notation that {1} and {2} are for) by watching some of the core tutorial videos for VC, especially those on editing commands.
http://voxcommando.com/mediawiki/index.php?title=Video_TutorialsNow that you have selected the correct database file, you should generate your xml again. Then the command should work correctly for all titles (hopefully). This is because VC will now be able to scan the correct file to get all of the titles in your current collection. If you don't re-generate the xml, it will simply use the information it scanned previously.
If you look in your command tree at the voice command for "Find Movie":
"Find, Search, Show" is the first payload.
The second payload is the actual payload xml file that contains the references to all of your movie media, so that action definitely needs the notation {2}.