SURROUND AUDIO, MULTICHANNEL, AAC

[villagepointe]

Just bought a new 2010 X5 SAV with Premium sound. It came with DVD Changer and DVD Player. Who is the manufacturer ?

Manual states that it Supports WAV, WMA, MP3 AND AAC with Surround Sound. It also simulates 2 channel audio in Surround.

In what file extension does it play in true surround?

Which of the following extension does AAC file support?
.aac, .m4a, .m4b, .mp4

Does it suport aacplus ?
It does not play even WMA files too.
It plays just WAV and MP3 files.

Is there any software to convert AAC files in multichannel format ?

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Thanks.