Hello,
For the MP610, use Coby Media Manager as the matching software, to get the fitting format for your player.
Coby Media Manager can be downloaded using next link:
http://www.cobyusa.com/?p=fix_mp822
Follow up the instructions for the download.
When running the manager in the top page setup your player
the MP610 AC or AL as your player: select Tools > Device Manager...
and Add>> yours.
Click on your player and go into Configure... to see the player's Synchronization setup and
Output file format: AMV for the AC and MTV for the AL version.
Use the Help function in the page top of Coby Media Manager for more
information using the software.