What is a CG file?
A .CG file can be several different things. Most commonly, it is a game graphic archive used by visual novel game engines like KiriKiri or NScripter. In this context, it stores compressed bitmap images for the game.
Another very common use is as a Cg Program. These are shader files written in the Cg (C for Graphics) shading language developed by NVIDIA. Game engines and 3D rendering applications use these files to control complex visual effects.
Additionally, a .CG file might be a database used by accounting software like Conti-Express or Tango Gestión, which relies on the standard Jet Database format. Finally, it can be a chromatography signal data file created by Agilent ChemStation.
How to open CG files?
Because a .CG file can be a game graphic, a shader script, a database, or scientific data, you must know its specific type to open it correctly.
If the file is an NVIDIA shader program, you can open it with a simple text editor like Notepad++ or view it using the NVIDIA Cg Toolkit.
If it is a game archive from KiriKiri or NScripter, you will need specialized extraction tools to unpack the images.
If it is an accounting database, you might be able to open it with Microsoft Access, because it uses the Microsoft Jet Database Engine.
Best practices and troubleshooting
Do not guess the file type and blindly open it in random software. A text editor will open a shader perfectly, but it will corrupt a game graphic archive or a database if you accidentally save it.
Instead, you can use viewer.online/cg to analyze your .CG files. The tool will identify the exact format and creator software. You can inspect the file structure, extract readable text, and check whether an online preview is available.
Software and tools
- NVIDIA Cg Toolkit for compiling and reading Cg Program files.
- Visual Studio Code for editing shader code.
- Microsoft Access for inspecting JetDB accounting databases.
- Agilent OpenLab for analyzing chromatography data.
Summary
Because the .CG extension has multiple possible meanings, viewer.online/cg is extremely useful for identifying, inspecting, and understanding .CG files without installing software or dealing with compatibility problems.