The OpenGEX file format is registered with the Internet Assigned Numbers Authority (IANA) as the model/vnd.opengex media type.

[1] The OpenGEX format is defined by the Open Game Engine Exchange Specification,[2] which is available on the official website opengex.org.

It begins with a group of Metric structures that define the units of measurement and the global up direction.

The geometry object structure contains a single mesh of triangle primitives that includes per-vertex positions, normals, and texture coordinates.

Finally, the Material structure at the end of the file contains the green diffuse reflection color.