MUM File Extension

What is MUM file?

MUM filename suffix is mostly used for Windows Vista Update Package files. Windows Vista Update Package specification was created by Microsoft. Files with MUM extension may be used by programs distributed for Windows platform. Files with MUM extension are categorized as System Files files. The System Files subset comprises 323 various file formats. Users are advised to use Microsoft Windows Update software for managing MUM files, although 2 other programs can also handle this type of file.

Programs which support MUM file extension

The following listing features MUM-compatible programs. MUM files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

How to open file with MUM extension?

Problems with accessing MUM may be due to various reasons. Fortunately, most common problems with MUM files can be solved without in-depth IT knowledge, and most importantly, in a matter of minutes. The list below will guide you through the process of addressing the encountered problem.

Step 1. Get the Microsoft Windows Update

The main and most frequent cause precluding users form opening MUM files is that no program that can handle MUM files is installed on user’s system. This one is an easy one. Select Microsoft Windows Update or one of the recommended programs (for example, Microsoft Windows Vista, Microsoft Windows 7) and download it from appropriate source and install on your system. The full list of programs grouped by operating systems can be found above. If you want to download Microsoft Windows Update installer in the most secured manner, we suggest you visit website and download from their official repositories.

Step 2. Verify the you have the latest version of Microsoft Windows Update

You still cannot access MUM files although Microsoft Windows Update is installed on your system? Make sure that the software is up to date. Software developers may implement support for more modern file formats in updated versions of their products. If you have an older version of Microsoft Windows Update installed, it may not support MUM format. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Microsoft Windows Update.

Step 3. Set the default application to open MUM files to Microsoft Windows Update

If the issue has not been solved in the previous step, you should associate MUM files with latest version of Microsoft Windows Update you have installed on your device. The process of associating file formats with default application may differ in details depending on platform, but the basic procedure is very similar.

Change the default application in Windows

• Right-click the MUM file and choose Open with option
• Next, select the Choose another app option and then using More apps open the list of available applications
• Finally select Look for another app on this PC, point to the folder where Microsoft Windows Update is installed, check the Always use this app to open MUM files box and conform your selection by clicking OK button

Change the default application in Mac OS

• By clicking right mouse button on the selected MUM file open the file menu and choose Information
• Open the Open with section by clicking its name
• Select the appropriate software and save your settings by clicking Change all
• If you followed the previous steps a message should appear: This change will be applied to all files with MUM extension. Next, click the Continue button to finalize the process.

Step 4. Check the MUM for errors

You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper MUM file. Being unable to access the file can be related to various issues.

1. The MUM may be infected with malware – make sure to scan it with an antivirus tool.

If the MUM is indeed infected, it is possible that the malware is blocking it from opening. It is advised to scan the system for viruses and malware as soon as possible or use an online antivirus scanner. MUM file is infected with malware? Follow the steps suggested by your antivirus software.

2. Ensure the file with MUM extension is complete and error-free

Did you receive the MUM file in question from a different person? Ask him/her to send it one more time. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. It could happen the the download process of file with MUM extension was interrupted and the file data is defective. Download the file again from the same source.

3. Check if the user that you are logged as has administrative privileges.

Some files require elevated access rights to open them. Switch to an account that has required privileges and try opening the Windows Vista Update Package file again.

4. Make sure that the system has sufficient resources to run Microsoft Windows Update

If the system is under havy load, it may not be able to handle the program that you use to open files with MUM extension. In this case close the other applications.

5. Ensure that you have the latest drivers and system updates and patches installed

Latest versions of programs and drivers may help you solve problems with Windows Vista Update Package files and ensure security of your device and operating system. Outdated drivers or software may have caused the inability to use a peripheral device needed to handle MUM files.

Do you want to help?

If you have additional information about the MUM file, we will be grateful if you share it with our users. To do this, use the form here and send us your information on MUM file.