.CSM File Extension

File Type:
Steam Game Backup File

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

What is a CSM file?

Csm file extension has Steam Game Backup file type, developed by Valve, which is associated with the "backup files" category.

Steam is a popular digital distribution service that provides access to video games and software. Backup files used by this platform have the .CSM extension. They store backup data for games that have been played via Steam. CSM files function similar to .CSD and .SIS files. All mentioned files can be found in the corresponding game folder in the "Steam Backups" directory. 

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

csm file icon
File Type:
Steam Game Backup File
Backup Files

How to open CSM file?

Double click the csm 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 .csm 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 csm 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 csm 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 CSM 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 csm file as well. Download Universal File Viewer for your OS.

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