COF File

What are COF files and how to open them

Are you having problems opening a COF file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your COF files.

What is a COF file?

COF files have multiple uses, and Maxon Cinema 4D Coffee Shader is one of them. Read more about the other uses further down the page.

Maxon Cinema 4D Coffee Shader

Maxon Cinema 4D Coffee Shader files are source code scripts written in Cinema 4D's now-deprecated COFFEE scripting language. They define custom shaders, material channel behavior and similar programmable elements that extend Cinema 4D's rendering or material system. These files facilitate creating texture shaders, channel shaders, or other visual effects by scripting custom logic inside Cinema 4D.

They are text-based files, saved as ASCII text created via Cinema 4D's Script Manager, COFFEE Editor, or any plain-text editor. The format functions as plugin-script source code: it is intended to be read (editable) rather than binary. COFFEE source scripts with this format can be compiled into a binary form (with extension COB) when distribution or obscuring of source is desired.

Each file begins with recognizable tokens or keywords typical of COFFEE shader scripts, for example "FillData(data)", "REGISTERCHANNELSHADER(…)", "EDITDATA(DATA)", "GETOUTPUT(DATA", "MAIN()", and "RETURN", which help distinguish this file format at the binary or textual level.

How to open COF files

Important: Different programs may use files with the COF file extension for different purposes, so unless you are sure which format your COF file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested five different COF openers which you will find listed below.

Last updated: August 31, 2026

All known file formats using extension .COF

While Maxon Cinema 4D Coffee Shader is a popular type of COF-file, we know of 2 different uses of the .COF file extension. Different software may use files with the same extension for different types of data.

Quartus Conversion Setup File

Quartus Conversion Setup File format stores settings for converting one type of FPGA programming file into another using Intel Quartus Prime's Convert Programming Files feature. It preserves all the parameters needed to reproduce a file conversion, such as output filename, target device options, and conversion modes, so the same conversion can be repeated without re-entering settings.

These files are created by selecting Save Conversion Setup in the Convert Programming Files dialog (or using the quartus_cpf command-line tool) after specifying input bitstream files (e.g. .sof), output formats (.pof, .jic, .rbf, .hexout, .rpd etc.), device properties, and advanced options. Re-opening a conversion setup loads its settings into the dialog or into quartus_cpf to automate conversions.

Internally this is an ASCII XML file beginning with "<?xml version="1.0" encoding="US-ASCII" standalone="yes"?>" followed by a root element <cof>. It contains tagged fields like output_filename, n_pages, width, mode, sof_data, version, create_cvp_file, options with subfields such as map_file, and advanced/device-family specific options.

Various apps that use files with this extension

These apps are known to open certain types of COF files. Remember, different programs may use COF files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about COF file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.