using pc card as input on rmx

im using rmx usb connected with no issue. but i have on my pc some audio files midi karaoke that cant be played by my virtual dj software and i want to be able to play it thru the sound card out from the pc, thru the rmx.
is this possible?
normally, i used the headphone mini output to send music from the pc to another source as aux in.
how can i accomplish this, i mean, play the file in the pc and the sound output thru the rmx?
thanks

Try selecting the WDM option in Hercules Dj Control Panel , that didn't worked for me when i had it but maybe it will with you , if it doesn't well just unplug the USB from the PC.