Autorun.inf In Usb Key !

[mumuuu]

HI ALL

i set up a presentation which is suppose to be automaticly run from an usb key each time u connect it to a computer .....

so i though to create an autorun .... like in my auto install software cd's but i was wrong this is not working

& if i do an .iso cd with nero WELL that WOrk but i want it on USB key

here is my autorun :

[autorun]open=cmd.bat

so if someone knows how to do that ..... pleaz tell me

thx by adcance