msi

.msi — Microsoft Windows Installer Package

Microsoft · 1999

Developer

Microsoft

What is a .msi file?

An MSI file is a database file used by the Microsoft Windows Installer service to install, repair, and remove software. It contains all the information and code needed to update the application. These packages are designed to streamline the installation process and ensure consistency across different Windows systems.

Programs That Open .msi Files

Platform	Program
Windows	Microsoft Windows Installer	Free	Official

Common Problems with .msi Files

⚠️ MSI file is corrupted or damaged, preventing installation.

Try re-downloading the MSI file from a trusted source. If the issue persists, run a system file checker (SFC) scan or use the Program Install and Uninstall troubleshooter from Microsoft.

⚠️ Incomplete or failed installation.

Ensure you have administrative privileges. Check the Windows Event Viewer for specific error messages related to the installation. Temporarily disable antivirus software during installation and retry.

⚠️ MSI error codes during installation.

Search online for the specific MSI error code (e.g., 1603, 1602) to find detailed explanations and troubleshooting steps provided by Microsoft or the software vendor.

Frequently Asked Questions

What is an MSI file?▼

An MSI file is a package file used by the Microsoft Windows Installer service to install software on Windows operating systems. It contains information about the application, files to be installed, and registry settings.

Can I open an MSI file directly?▼

MSI files are not designed to be opened directly by users like documents or images. They are intended for the Windows Installer service to read and execute for software installation. You can view the contents using specialized tools, but direct execution usually means initiating an installation.

How do I uninstall software installed via an MSI file?▼

Typically, you can uninstall software installed from an MSI file through the 'Add or Remove Programs' (or 'Apps & features') section in Windows Settings or the Control Panel. The uninstaller information is usually contained within the MSI package itself.

Technical Details

MSI files are essentially structured storage files based on the OLE Compound File Binary Format. They contain tables defining installation parameters, files to be copied, registry keys, and custom actions, often preceded by a specific header that identifies them as Windows Installer packages.

Did You Know?

The Windows Installer (MSI) technology was first introduced with Windows 2000 and Windows Me.

MSI packages are essentially relational databases that the Windows Installer service queries to manage software installations.

Before MSI, software installation on Windows often relied on less standardized setup executables, leading to inconsistencies.

Security Information

MSI files can contain executable code, so always download them from trusted sources. Be cautious of files from unknown vendors as they may contain malware.