Hi Pere,
Have a look at this post:
can not convert *mov video to *amv.
You might need to convert the Quicktime files first to .AVI or .WMV before you can convert it using the AMV Convert Tool.
What you can do is try to install the
SLD Codec Pack 2.2. Download it from here:
http://www.mympxplayer.com/dload.php...file&file_id=6
You can also try using the
RAD Video Tools to convert your Quicktime files as well.
Hope that helps.
Good luck.