The .md5 file is a hash file, it is used to determine that there is no corruption in the files you download from the torrent. Here is a direct link to BreezeHash, a software created by a friend that can calculate the hashes of files as well as check the integrity of files using a hash file such as .md5
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tanzaa4321
Tokuten BD [SP17] Advacne Theatrical Ver. - 01: video is missing after 1:26:08
Also is it normal that DTS-HDMA only have 4 audio channels and not 5.1?