rundll32.exe problem executing a dll

I have a Tablet (old HP/Compaq TC1100, 1.2 GHz, 1GB RAM). After some fiddling around with old drivers everything is running fine.
The TC1100 comes with a software called qmenu with which you can toggle the wireless on and off. That is working.
To do that via a script or assigning a button to it under XP one could execute the dll of that program via rundll32.exe.
In the directory of the program executing "rundll32.exe qsupport.dll,WirelessToggle" would turn on/off the wireless device.
Now under Windows 7 (Professional Upgrade) nothing happens. I see the spinning cursor for a moment and then it's done. No trace of function, wireless stays the way it was. The Eventlog doesn't show anything in regard of that (or anything at the time of execution).

Does anyone have a clue what is going wrong here? Other rundll32 commands, for eaxample with shell32.dll are working.

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