Autostart for Firefox on CD-R

Hello everybody.

I've got the problem that it seems not possible for me to start PortableFirefoxLive from a cd-r using autostart.

I'd like to have Firefox starting on putting the cd-r into a drive. So I got the edited firefox.ini to run Firefox from a cd-r, copied the whole stuff to the root of the cd-r and used the following string in the autostart.inf:

[autorun]
open=FirefoxPortable.exe
icon=sicon.ico

So, if I put the cd-r in any computer nothing happens, only the dataexplorer pops up and shows me the content of the cd-r ... that's it.
It seems that the loader does not start. If I start it by doubleclick everything is fine.

So what's the fault? Any hints for me?

Greetings and thanks...