Project file used by Cineform Studio, a video editor/converter software; once you create a project the GCS file is created.

GoPro Cineform Studio enables the user to import footage from the 3D HERO System and convert it into viewable 3D files. The 3D HERO System is comprised of 2 HD HERO 1080p cameras that can record video and photos in 2D and 3D at the same time. Some editing features available with the GoPro Cineform Studio software include: saturation, contrast, exposure, frame-rate adjustment for slow motion, zoom, and cropping. After the user finishes their project they can then export their compressed side-by-side project into a .MOV file and watch it online at sites like YouTube or on their 2D or 3D TV.