Hey!
I have got files in wma 5.1 how can I conver to ac3.

I'd like to know how you generated 5.1 channel WMA files!

I ran across an app called Audio-to-DVD that allows one to convert music files to ac3. Its somewhat labor intensive but depending upon the source file, I've gotten from 12 to 20 hours of music on a DVD using this program. The sound quality is excellent in the finished disc--though naturally the lossy source files are detectable.

Open it with Audition, it will automatically decode the file into 6 separate mono tracks, then u save each track as a WAV. The track order is L-R-C-LFE-SL-SR. I.e. "test.wma" will open as "test.wma" (Left), "test [2].wma" (Right), "test [3].wma" (Center), and so on. So "test [3].wma" should be save as "test_Center.wav" for example, or "test [5].wma" to "test_Surround Left.wav".
Then create a .mux file with BeLight 0.22 beta9 or 0.21, open it and select AC3 for compression.

Thx!
It's working