Home : File Types : MSU File

.MSU File Extension

File TypeWindows Vista Update Package

DeveloperMicrosoft
Popularity
3.9 (73 Votes)
CategoryMisc Files
FormatBinary

Binary

This file is saved in a binary format, which requires a specific program to read its contents.

What is an MSU file?

Update file used by Windows Update, an application included with Windows Vista, Windows 7, and Windows Server; contains updates for applications and files; installed by the Windows Update Stand-alone Installer (Wusa.exe), which is run by Windows Update automatically (the user generally does not need to manually install MSU files).

More Information

Each MSU file contains four elements:

  1. Windows Update metadata, which describes the update package
  2. One or more .CAB files that store the update data for the package
  3. An .XML file which describes the contents of the MSU file
  4. A properties file that is read by Wusa.exe

You can manually extract the contents of an MSU file at the Windows command prompt by typing:

expand -f:* "example.msu" output_directory

You can then manually install the update package by typing the following command:

pkgmgr.exe /n:output_directory\example.xml

(example.msu and example.xml have the same filename prefix).

NOTE: Earlier versions of the Windows operating system used .MSI files for updates.

FREE DOWNLOAD
Open over 300 file formats with File Viewer Plus.
Programs that open MSU files
Updated 10/21/2011

About the file extension msu

Our goal is to help you understand what a file with a *.msu suffix is and how to open it.

The Windows Vista Update Package file type, file format description, and Windows programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and do not publish any information we have not been able to verify.

If you would like to suggest any additions or updates to this page, please let us know.