.MSI File Extension

Microsoft Installer Package

An MSI file is a package that contains information to install an application on Windows. It has a standardized structure and may be used for Windows updates or third-party software. MSI files store th...

General Information

Title MSI File Extension
Extension .msi
Full Form Microsoft Installer Package
File Type Installation Package
Developer Microsoft
MIME Type application/x-msi

File Function

Primary Function Software installation
Additional Functions Software update, Uninstallation
Features Transactional operations, Rollback support

File Characteristics

Quality Structured data
Supports Layers N/A
Supports Transparency N/A
Editable With tools

Use Cases

Software Installation Yes
System Administration Yes
Software Distribution Yes

Security and Practices

Security Risks Malicious code
Best Practices Signature verification, Safe sources

Historical/Version Information

Initial Release 1999
Latest Windows Installer Version 5.0 with Windows 10

Associated Types

Similar Extensions .msp, .mst, .cab

Software Compatibility

Software Usage Policy OS Compatibility
Windows Installer Included with Windows Windows
Orca Free Windows
InstEd Free, Paid versions Windows