[MrNice]

This file won't play on my Squeezebox, I suspect 96kHz is too much for the poor thing. This doesn't look like it's a DTS file though, so the fact PCM is being output would be correct as that's with it most probably is, WAV not DTS.

However, Mediainfo says:
FLAC Free Lossless Audio Codec
4mn 55s Variable 4 312 Kbps
6 channels Front: L C R, Back: L R, LFE
96.0 KHz 24 bits
152 MiB (99%)
libFLAC 1.2.1 (UTC 2007-09-17)
and
DTS Digital Theater Systems
14 Little 1
4mn 55s
Constant 1 411.2 Kbps
6 channels Front: L C R, Side: L R
44.1 KHz 24 bits
Lossy
49.7 MiB (100%)

So it looks to me that x86 - and possibly Pi - XBMC 13.1 (OpenELEC 4.0.2) is able to correctly passthrough WAV encoded DTS and also multichannel PCM from FLAC and WAV "containers" (not entirely sure of the terminology here, but hopefully you all understand).

I don't agree/understand: If OE is able to passthrough WAV encoded DTS, my AVR should decode DTS and display DST (not PCM as it does)