Opening MUM files

Did your computer fail to open a MUM file? We explain what MUM files are and recommend software that we know can open or convert your MUM files.

What is a MUM file?

The .mum file extension is most commonly associated with Windows Vista update files. These files contain software updates for the Microsoft Vista operating system. These files are automatically downloaded and installed by the Windows operating system.

Try a universal file viewer

In addition to the products listed above, I would suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.

By Prof. Jones (The File Expert)

Chief Content Editor and File Expert

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