DTSHD is an extension that holds files used by an audio processing software package called DTS-HD Master Audio Suite. A DTSHD file is used to store audio data encoded with the DTS-HD Master Audio codec. This codec allows you to generate streams in both lossy and lossless compression formats. These files often accompany video materials on Blu-ray Discs and DVDs. This allows for the surround sound effect.

DTS-HD Master Audio Suite is a tool developed by DTS, Inc. for Windows and Mac OS X.