Opening a COF File

The COF file type is primarily associated with MPLAB X.

COFFile Extension COF
File extension: COF
File type:  object

What is a COF file?

COF files mostly belong to MPLAB X by Microchip. A COF file is an executable object created by MPLAB X integrated development environment and saved in Common Object File Format (COFF). This file contains machine code and symbolic debugging information generated by the ALN Linker component and run on an embedded device. COF is also the filename extension of a conversion setup (device information, file names, device properties etc.) file used by Quartus II FGPA and CPLD development environment. Another type of CA file is a container order used by CA Client Automation tool. AutoCAD computer-aided design software uses a COF file to store various CAD data.

How to open a COF file

You need a suitable software like MPLAB X to open a COF file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your COF file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a COF file directly in the browser:. Just drag the file onto this browser window and drop it.

Online COF Text Viewer

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Programs that open and convert COF files:

  1. MPLAB X by Microchip
    See the previous paragraphs to learn more about the main application. COF files are often referred to as MPLAB X executables because this type of file is primarily created or used by this software.
  2. CA Client Automation (container order) by Broadcom
    CA Client Automation is a client system management solution for enterprise users. It uses a COF file to store its container order. This file format is classified as Settings.
  3. Days Of Death (data archive) by ColemanSystems
    Days Of Death is a discontinued computer game. It uses program/media information saved in a COF file. This file format is classified as Game.
  4. Quartus II (conversion setup) by Intel
    Quartus II is a CPLD and FGPA design and development environment. Its conversion setup is saved in a COF file. This file format is classified as Settings.

Technical Data for COF File Extension

File classification:
Executable
Related files:

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: CrystalPlayer.COF
EXEFile: %ProgramFiles%\Crystal Player\Crystal.exe %1

ProgramID: CrystalPlayer.COF
EXEFile: %ProgramFiles%\Crystal Player\CrystalFree.exe


a cof object is a special file format by Microchip and should only be edited and saved with the appropriate software.

How to solve problems with COF files

  • Associate the COF file extension with the correct application.
  • Update your software that should actually open objects. Because only the current version supports the latest COF file format. Search, therefore, e.g. on the Microchip manufacturer website after an available MPLAB X update.
  • To make sure that your COF file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
  • Click here to open your .COF file online - secure, fast, and no downloads needed.
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