Hey Tref,
My take on it is the Disc decoder unit is a separate unit from the USB device. Many car stereo use the set top box DVD controller for the DVD/Disc drive, and use another processor for Navi/USB everything else. Just because Navi says "Divx can play" does not mean USB is included. And, just to make more complicated, there are many different types of files with .avi extension that won't play in a DRM device or that are .avi wrapper with contents that aren't compatible with divx decoder in the radio.
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