how my dmo to get the asf url which wmp playing?

I am writing a decoder-DMO to decode custom stream contained in asf
files

when I play the files with WMPlayer,

how my dmo to get the asf filename or path or url which wmp playing?

On 11=D4=C210=C8=D5, =CF=C2=CE=E710=CA=B100=B7=D6, Dream sdk <tex...@gmail.

On 11=D4=C210=C8=D5, =CF=C2=CE=E710=CA=B100=B7=D6, Dream sdk <tex...@gmail.=

another question is :

I can call ShellExecute(0,"open","notepad.exe",    "","",SW_SHOW )
within InternalProcessInput,it work fine;

but when I use ShellExecute(0,"http://www.google.com","",
NULL,NULL,SW_SHOW);
to open a website,nothing is happened,why?

On 11=D4=C211=C8=D5, =C9=CF=CE=E712=CA=B134=B7=D6, Dream sdk <tex...@gmail.

On 11=D4=C211=C8=D5, =C9=CF=CE=E712=CA=B134=B7=D6, Dream sdk <tex...@gmail.=

ok! I can open a website use ShellExecute(NULL,"open","iexplore.exe",
now.

new question:
Can my dmo get the asf file metadata?