.COS File Extension

Phase One
File Type:
Capture One Settings File

Having trouble opening .cos extension? Don't panic! This page explains what cos files are as well as suggests programs you may use to open cos files. You can download these programs through this page.

What is a COS file?

Cos file extension has Capture One Settings file type, developed by Phase One, which is associated with the "settings files" category.

Capture One – an application for managing and organizing digital photos – uses these image settings files. They are needed to save corrections done to the image (white balance, exposure, color temperature, etc.) and simple nondestructive edits as well. After the user finishes with editing, the program saves a COS file that uses the same name as the original file but also adds a new extension. In other words, edited file Photo01.jpg will be saved as Photo01.jpg.cos. When all other adjustments are made, the user can process the settings and photo in order to apply all changes and receive an output image.

To learn how you can open the given file, read the information below.

cos file icon
Phase One
File Type:
Capture One Settings File
Settings Files

How to open COS file?

Double click the cos file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .cos extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the cos extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the cos file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open COS files

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the cos file as well. Download Universal File Viewer for your OS.

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