With the file extension DTS audio files are marked in the so-called Digital Theater Systems Format (DTS). It is a multi-channel format, which is mainly used on DVDs and BluRays. However, most of the files are not stored on the data carriers, but are stored inside the respective container (vob or evo). DTS is a proprietary, lossy compression method that supports resolutions up to 24 bits and sampling rates up to 96 kHz with different bit rates.
The DTS files can contain DTS sound at 768kbit or 1.5MBit. The former is mainly used on DVDs. The latter is a so-called DTS core, which is the lossy part of the DTS-HD standard.