Making audio to 5.1

I was wondering if this was possible?
For example stereo to 5.1:
-Left = rear left
-right = rear right
-center = left+right

anyone can help me?

i got LAV as renderer.

ffdshow has an option called "expand stereo" which does that. You can find it in its Mixer settings. You need to use ffdshow either as decoder or as audio processor.

LAV does not have this functionality.

Thanks for the reply, but how do i change it?

When i install the k-lite its automatically set every audio renderer to Lav, is there any possible way to change the audio renderer for each apps?

Re-install the pack. Then you can choose it.