| File Type |
Windows Vista Update Package |
| Popularity |
 Average |
| Category |
Misc Files |
| File Description |
Update file used by Windows Update for updating programs and files in Windows Vista and Windows Server 2008; installed by the Windows Update Stand-alone Installer, which is run by Windows Update.
Each MSU file contains four elements:
- Windows Update metadata that describes each update package
- One or more .CAB files that contain the update data
- An .XML file that describes the contents of the MSU file
- A properties file read by Wusa.exe
NOTE: Previous versions of the Windows operating system used .MSI files for Windows updates. |
| Program(s) that open msu files |
 |
Windows |
 Microsoft Windows Update Stand-alone Installer (Wusa.exe) |
|
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| Updated 8/22/2008 |
 Fix file extension .MSU errors. |
