Files with cg suffix can be often found as special shader programs saved in Cg programming language from nVidia.
Software that open cg file
CG file extension - nVidia CgFX program
What is cg file? How to open cg files?
File type specification:
File extension cg seems to be related to a special shader program written in nVidia Cg programming language. A .cg file contain specification for model shader, including shapes and other settings.
The default software associated to open cg file:
Cg 
(obsolete software)
Company or developer:
NVIDIA Corporation
The Cg Toolkit is a legacy NVIDIA toolkit no longer under active development or support. Cg 3.1 is our last release and while we continue to make it available to developers, we do not recommend using it in new development projects because future hardware features may not be supported.
NVIDIA was proud to introduce programmable shading with Cg, which supported dozens of different OpenGL and DirectX profile targets. It allowed developers to incorporate interactive effects within 3D applications and share them among other Cg applications, across graphics APIs, and most operating systems (Windows XP, Vista and Windows 7, Mac OS X for Leopard, Snow Leopard & Lion, Linux 32-bit & 64-bit) as well as balance effect complexities with client GPU capabilities.
Company or developer:
NVIDIA Corporation
CUDA Toolkit has all the development tools, libraries, and documentation you need to create applications for the CUDA architecture.
List of software applications associated to the .cg file extension
Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open cg file, edit cg file, convert cg file, view cg file, play cg file etc. (if exist software for corresponding action in File-Extensions.org's database).
Hint:
Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting cg files.
Software that open cg file - nVidia CgFX program
Programs supporting the exension cg on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for open cg file action.
Microsoft Windows:
Main software associated with cg file by default:
Cg (obsolete/discontinued)
CUDA Toolkit
