“The file is only 2 MB is this OK?” Surely not.
I think something went wrong when the map was created. You could try velomap (ftp://ftp5.gwdg.de/pub/misc/openstreetmap/openmtbmap/velomap/), the file there is some 300 MB which looks OK.
[Edit] By the way, there are many forums in other languages, e.g. German: http://forum.openstreetmap.org/viewforum.php?id=14 [/Edit]