Found the problem:

"<EMBED SRC="mesh.swf" WIDTH=953 HEIGHT=751 quality=low loop=false TYPE="application/x-shockwave-flash""

"mesh.swf" should be "f_mesh.swf" instead!

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt