Not all apps can to open file from command... but need to try it!

Example for KMPlayer:

• 1. Try to run from terminal.
  "kmplayer" -> not found
• 2. Okay, then go to "/usr/share/applications/hildon" and reading ".desktop" file.
  "kmplayer.desktop"
  Exec="/opt/kmplayer/bin/kmplayer"
  It's path to binary - u can run it!
• 3. Try to run from Hamster.
  "/opt/kmplayer/bin/kmplayer %s" -> it's work - release & happy

"leafpad %s" -> working.
"evince %s" -> working too.
....

I think it's good feature request - preinstalled examples for applications, OR better - "Open with..." show dialog with list of applications, loaded from .desktop files - choose and auto add name and command with %s param favorites in top - it's really like "Open with...". And for commands other item menu...