CMN File Description

Author:   |   Amended: November 26, 2018

Microsoft Silver

CMN File Summary

The CMN File Extension has one primary file type, Systems Management Server (SMS) Update format, and can be opened with Microsoft Systems Management Server released by Microsoft Corporation. Generally, these files are considered Data Files.

File Extension CMN is supported by Windows, Mac, and iOS operating systems. These types of files can be found on both desktop and mobile devices. The main CMN file type has a Popularity Rating of "Low", meaning these files are not frequently present on your typical desktop or mobile device.

Although there is a lot more to know about CMN files, those are the most important details of these types of files. If you are having trouble opening these files, or would like more detailed information, please see our comprehensive information below.

Low
File Type Popularity
7504
Standing

/ 11690

Active

Relevance

26

November

2018

Edited

FileViewPro Opens CMN Files

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Varieties of CMN Files


Primary CMN File Association

.CMN
File ID:.cmn
Group:Systems Management Server (SMS) Update

A CMN file is a file associated with the Microsoft Systems Management Server (SMS) update. It contains collection membership update data.

Company: Microsoft Corporation
Kind:Data Files
Folder: HKEY_CLASSES_ROOT\.cmn

Software Programs That Open The Systems Management Server (SMS) Update:


Microsoft Systems Management Server by Microsoft Corporation

Windows
Mac
iOS
Android
Linux
Symbian OS

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CMN Usage


Top Devices

Desktop (84.34%)
Mobile (14.29%)
Tablet (1.37%)


Troubleshooting Problems Opening CMN Files


Issues Opening CMN Files

Microsoft Systems Management Server Not Present

If you attempt to load your CMN file, you experience a message such as "Can't Open CMN Files". When this happens, it is commonly due to Microsoft Systems Management Server missing in %%os%%. The typical path of opening your CMN with a double-click won't work because %%os%% cannot make the program connection.


Tip: If you have another software that you know opens CMN files, you can select it by hitting the "Show Apps" button.


Outdated Microsoft Systems Management Server

In other instances, your Systems Management Server (SMS) Update file version may not be supported by your version of Microsoft Systems Management Server. If you've got the wrong version of Microsoft Systems Management Server installed, you'll need to install the correct version. The primary cause of this problem is that your Systems Management Server (SMS) Update file was created by a different (newer) version of Microsoft Systems Management Server than what's installed.


Tip: If you right-click on your CMN file, then select "Properties" (Windows) or "Get Info" (Mac), you can obtain hints about what version you need.


Ultimately, most of the difficulties opening CMN files are due to having the wrong version of Microsoft Systems Management Server installed.


More Causes of Problems Opening CMNs

In the majority of cases, installing the right version of Microsoft Systems Management Server will resolve your issue. If you are still having problems opening CMN files, there may be other issues that are preventing you from opening these files. Additional factors include:

  • Invalid CMN file references in the Windows Registry (the "phonebook" of the Windows Operating System)
  • The CMN file description within the Windows Registry was removed
  • Invalid installation of a CMN-associated program (eg. Microsoft Systems Management Server)
  • CMN file corruption
  • Malware-tainted CMN file can't be opened
  • Hardware related to CMNs has device driver corruption
  • Your computer does not have the adequate system resources to open the Systems Management Server (SMS) Update format

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