GoToMeeting Codecs
Finally I have solved the problem like that; it was some work to do but it works:
Installed the gotomeeting-codecs and the "any video converter" on windows in a virtual machine. Copied the g2m.dll from gotomeeting folder into the codecs folder from the any video converter installation. Now I can drag all my codec-coded videos into the converter program and let it run. It is some work to do, but after all this files can be played on any machine with any player.