AAC-AC3-MP4 AUDIO.My player only plays true 5.1 dts useing ac3

Hi im woundering if my media player should be able to play dts 5.1 useing different audio formats or is AC3 the only one.I reformated my media player awhile back because of firmware update problems so only have 3.00.28 installed&read that there are still problems with updates.thanks

This is the list of supported files

see if it helps