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If you want the Full HD audio experience through the PC at the moment the only solution is the HDAV 1.3 from Asus although expensive and still cannot pass 1080/24p it is the best solution for bitstreaming.

Now if you have one of the ATI 48XX series cards or one of the IGP's 8200/8300 or 9300/9400 and are willing to take a steep learning curve then Full HD audio is possible through those cards and M\B's i have mentioned.

The only way at the moment is to convert your Blu ray's to MKV format with .flac audio, All the necessary programs are freeware its just taking the time to learn how to convert them. And best of all MPC-HD or KmPlayer can play these MKV's back with no loss of picture quality or audio quality as .flac is the only as far as i know audio container that does not downsample through any windows operating system.