Setting Bluetooth operation of soundbar Sony HT-CT80

I successfully paired a Sony HT-CT80 soundbar with my home PC operating on Windows XP. For this reason I installed an ASSUS bluetooth dongle 4.0. Upon running the Windows Media Player the music is heared through the soundbar.
But, in this time the sound to the desktop speakers cuts.
Is it possible to play the music both through the HT-CT80 and PC desktop speakers simultaneously?
 
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