Convert dts encoded .wav song to dolby encoded audio

I own philips DVP3026 standalone player and it cannot play dts encoded audio files. I have a large number of dts encoded .wav(5.1) files, I would like to convert them to dolby(5.1) encoded audio file.
And also I was able to convert the files to stereo(2 channel) by using other softwares.I want to convert the files to 5.1 only. I tried various other softwares like besweet etc. but with no luck. Please help! please include a detailed explaination of the conversion.