.MSI file extension
To open .MSI files on Windows, double-click the .MSI file to launch the Windows Installer wizard, then follow the prompts.
To open a .MSI file, use Windows Installer on Windows (double-click it or run it with msiexec). On macOS, Linux, iOS, and Android, .MSI files are not generally usable as installers—transfer the file to a Windows PC if you need to install the software.
Last updated: June 10, 2026
Open on your device
Choose your operating system for a dedicated step-by-step opening guide.
How to open .MSI files
Use these platform-specific instructions to open .MSI files safely.
Windows
- Double-click the .MSI file to launch the Windows Installer wizard, then follow the prompts.
- If you need command-line control (install/repair/uninstall), open Command Prompt and use msiexec with the .msi file (for example, to run an install from the command line).
- If Windows blocks or warns about the file, verify the source before proceeding (only run installers you trust).
Mac
- .MSI files are Windows installer packages and are not typically installable on macOS. If your goal is to install the software, obtain a macOS-native installer from the software vendor.
- If you received an .MSI intended for Windows, transfer it to a Windows PC to run it with Windows Installer.
Linux
- .MSI files are Windows installer packages and are not typically usable as native Linux installers. If you need the software on Linux, look for a Linux package from the vendor instead.
- If the .MSI is meant for Windows deployment, transfer it to a Windows system and run it with Windows Installer/msiexec.
iOS
- .MSI files are not usable as installers on iOS. If you need to use the software, you’ll typically need a Windows PC to run the .MSI.
Android
- .MSI files are not usable as installers on Android. If you need to install what it contains, transfer the file to Windows and run it with Windows Installer.
Security notes
- .MSI files are executable installation packages: running one can install software, change system settings, and potentially add persistence. Treat them like any other program installer and only run packages from trusted publishers.
- Be cautious with unexpected .MSI files received via email or chat; attackers may use MSI installers as a delivery mechanism for malware because they can run installation actions through Windows Installer.
- Prefer obtaining MSI packages directly from the software vendor or your organization’s managed software distribution, and avoid running modified or repackaged installers from unverified sources.
Can't open this file?
These are the most common causes and fixes when .MSI files fail to open.
Common reasons
- The .MSI won’t run or opens with the wrong app
- Windows Installer reports an error or install fails
- The file looks like an “archive,” but you can’t browse its contents
Fix steps
- On Windows, try double-clicking again; if it still fails, use the Windows Installer command tool (msiexec) to run the package.
- If you are on macOS/Linux/iOS/Android, move the .MSI to a Windows PC—.MSI is primarily for Windows Installer.
OS-specific troubleshooting
What is a .MSI file?
.MSI is the Windows Installer Database format for installation packages. It contains installation logic and resources used by Windows Installer to install applications, apply changes, or uninstall them. Windows uses Windows Installer (and msiexec.exe) to process these packages.
Background
MSI packages are a core part of the Windows Installer technology used for software deployment on Windows. Instead of being a simple “archive,” an .MSI file is an installation database that describes what to place on disk, what registry changes to make, and how the application should be configured during install, repair, or uninstall.
Common MIME types: application/x-msi
Further reading
Authoritative resources for more details on the .MSI format.
Common .MSI issues
The .MSI won’t run or opens with the wrong app
Windows may not be associating .MSI with Windows Installer correctly, or you may be trying to open it on a non-Windows platform.
- On Windows, try double-clicking again; if it still fails, use the Windows Installer command tool (msiexec) to run the package.
- If you are on macOS/Linux/iOS/Android, move the .MSI to a Windows PC—.MSI is primarily for Windows Installer.
Windows Installer reports an error or install fails
The package may be incompatible with your system, require elevated privileges, or be incomplete/corrupted.
- Re-download the .MSI from the original publisher to rule out a partial or corrupted download.
- Run the installer with appropriate permissions (many installs require administrative rights).
- If you manage deployments, use msiexec to get clearer installation behavior and diagnostics (for example, to control install/repair/uninstall actions).
The file looks like an “archive,” but you can’t browse its contents
.MSI is an installer database format, not a general-purpose archive you open like a .zip.
- If your goal is to install software, run it with Windows Installer (double-click or msiexec).
- If your goal is to inspect package behavior, use Windows Installer tooling and documentation (rather than renaming the extension).
FAQ
Is an .MSI just a compressed archive?
No. An .MSI is a Windows Installer database/package designed to be processed by Windows Installer. While it contains embedded resources, it is primarily an installation package rather than a general-purpose archive format.
How do I install an .MSI from the command line?
Use Microsoft’s Windows Installer command-line tool, msiexec.exe, which can install, modify, or uninstall MSI packages. See Microsoft Learn for supported options and examples.
Can I open or run .MSI files on macOS, Linux, iOS, or Android?
Generally no. .MSI is a Windows Installer format. If you need the software on those platforms, you usually need a platform-native installer from the vendor; otherwise, run the .MSI on Windows.
Is the MIME type application/x-msi official?
It is commonly used in practice, but the authoritative registry for standardized media types is IANA; consult IANA’s media types registry to verify whether a type is officially registered.
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