Getting to grips with AMI

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Just getting to grips with the AMI system in the S8, so far an 8GB USB stick with MP3's plays fine, but I only have a limited selection of those. Being a bit of an Audiophile I have a full library in FLAC and AIFF lossless file formats, and I am thinking (probably optimistically) that because the car has B&O it might support higher end formats - is this the case?

Also, is there a definitive list anywhere about the max size USB it can handle and what all the supported file formats are? i.e., video as well as audio?

Thanks