Nymphomaniacvoli2013720pbrriphindidubdual-audiox264mkv-h264_720p_vegamoviesmp4
: These are "containers." While the name lists both, it indicates the file is likely an MKV (which supports multiple audio tracks) renamed or converted for compatibility.
The string you provided appears to be a specific filename for a pirated movie file. Based on the naming convention, File Breakdown : These are "containers
: Downloading copyrighted content via unauthorized sources is illegal in many jurisdictions. : These are "containers
