Files with the .TSO extension contain information about edited audio and video materials – namely references to them, as well as data concerning the editions applied, such as sequencing, effects, and transitions. This is a video editing project file for the open-source OpenShot software for Linux systems.

OpenShot allows you to edit multiple paths simultaneously without changing the source files and perform single frame operations on any part in a non-linear manner. It uses the FFmpeg library, which offers support for several popular audio, video, and graphical file formats. After editing, TSO files are exported to an output video format supported by the software.