A TSCN file contains a scene created by Godot Engine, a free and open source game engine used to create 2D and 3D games. It stores information that details a single scene tree inside Godot Engine, which may include paths to external resources, internal resources, connections, and nodes.

To open a scene in a TSCN file in Godot Engine, select Scene → Open Scene... or Open Recent. To create a scene and save it as a TSCN file in Godot Engine, select Scene → New Scene or New Inherited Scene.... Then, select Scene → Save Scene or Save Scene As.... TSCN files are saved in plain text, which allows developers to more easily control versions and are more easily read by humans. Typically, Godot Engine is used to open TSCN files, but they may also be viewed and modified using a text editor.