.MSU File Extension

Microsoft Update Standalone Package

MSU files contain source code for initializing Windows Vista system updates, upgrades, fixes and patches. An .XML file describes the MSU file contents. A properties file is read by Wusa.exe. The Windo...

General Information

Title MSU File Extension
Extension .msu
Full Form Microsoft Update Standalone Package
File Type Update Package
Developer Microsoft
MIME Type application/octet-stream

File Function

Primary Function Offline updates
Additional Functions Security patches, Feature updates
Features Self-contained, Installable

File Characteristics

Quality Varies
Supports Layers N/A
Supports Transparency N/A
Editable No

Use Cases

System Administration Yes
Software Maintenance Yes
Network Deployment Yes

Security and Practices

Security Risks Unsigned risk
Best Practices Verify source, Check digital signature

Historical/Version Information

Introduced With Windows Vista
Associated with Windows Update, WSUS

Associated Types

Related Extensions .cab, .exe

Software Compatibility

Software Usage Policy OS Compatibility
Windows Update Standalone Installer Free Windows Vista, Windows 7, Windows 8, Windows 10, Windows 11