File Type Generic IconWindows Vista Update Package
File Format Proprietary (Microsoft)
Usage Open manually; may be referenced by an application
Rank ★ ★ ☆  Average

Package containing a software update or "hotfix" for Windows Vista; installed by Windows using the built-in software update program.

MUM files typically use the following file naming convention: "Package_[#]_for_kb[number]~[string]~[OS_version]~~[update_version].mum." The primary update file is named "Update.mum."

Open With

IconMicrosoft Windows Update

Updated 2007