A detailed filename doesn't guarantee quality. Safe, legal sources (even ad-supported free ones) won't hide malware behind a professional-sounding label like "-ORG 5.1- 720p" .
"ORG" meant original audio. "5.1" meant surround sound. "720p" meant decent quality without a huge download. He clicked download, waited two hours, and finally opened the file.
It sounds like you're referencing a file name for a download from a site like MkvHub. While I can't promote or verify piracy sites, I can turn this into a about that specific file name. Title: The 5.1 Surround Trap