.MTX File Extension
File Type 1MetaStream Scene File
What is an MTX file?
Three-dimensional scene saved in the MetaStream ASCII text format; uses XML-style tags to store information about the scene, such as global scene options, object (instance) hierarchies, camera locations, and animation data.
File Type 2MadTracker 2 Extension
.MTX File Association 2
Adds extra features or additional format support to the MadTracker audio tracker.