Most likely, this is a scene-style release of a fan-made episodic game or mod, repacked by “Skacat” (or a group posing under that name), version 13122, part 18.
Have you encountered this file? Do you know the true origin of “Symphony of the Serpent”? Contact the author via secure channels – this mystery is far from solved. Skacat- Symphony of the Serpent -18 - v 13122 M...
This specific version (v.13122) introduced several content updates and story scenes, such as: New Character Scenes Most likely, this is a scene-style release of