Sebastian,
The command to get the filename is indeed :
SendMessage(bsp_hand,WM_COPYDATA,appHWND,(LPARAM)& cds);
Are you sure the handle to your application = 0 ?
If you want to know how to write text to the OSD, take a look at the sampleplugin.c file in the SDK subdirectory.
I'm sure you'll find all the info you need in there.
Good luck,
Rafke P.
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