File Extension Search

.msu File Extension

Developer: Microsoft
File type: Windows Vista Update Package File
You're here because you have a file that has a file extension ending in .msu. Files with the file extension .msu can only be launched by certain applications. It's possible that .msu files are data files rather than documents or media, which means they're not meant to be viewed at all.

what is a .msu file?

A Windows Vista update package file contains source code used for initializing system updates, small upgrades or fixes and patches for Microsoft Windows Vista systems. These Windows Vista update package files are integrated with source code data compilation specifications proprietary to Microsoft Corporation, and these Windows Vista update package files are also implemented with encoding standards deployed by Microsoft for the MSU file format commonly used for the system updates, fixes and patches or small upgrades required by other Microsoft Windows-based systems. The Windows Update applet is a bundled application with many Microsoft Windows OS versions, including Microsoft Windows Vista, Microsoft Windows 7 and Microsoft Windows Server. These Windows Vista update package files are used by the Windows Update software of the Microsoft Windows Vista system to reference the source code and other pieces of data relevant for the initialization and startup of the installation process for these system fixes, upgrades and updates. This is facilitated by the Windows Update Stand-alone Installer program, a built-in application automatically initialized by the Windows Update applet.

how to open a .msu file?

Launch a .msu file, or any other file on your PC, by double-clicking it. If your file associations are set up correctly, the application that's meant to open your .msu file will open it. It's possible you may need to download or purchase the correct application. It's also possible that you have the correct application on your PC, but .msu files aren't yet associated with it. In this case, when you try to open a .msu file, you can tell Windows which application is the correct one for that file. From then on, opening a  .msu file will open the correct application. Click here to fix .msu file association errors

applications that open a .msu file

Microsoft Windows Update

Microsoft Windows Update

Windows Update is a service by Microsoft that gives updates for the Microsoft Windows operating system and its installed components, as well as the Internet Explorer. An elective feature disables access to Windows Update, enabling instead access to Microsoft Update, an extended version of the service which gives updates not just for the operating system and Internet Explorer, but also for other Microsoft software running under Windows, such as Windows Live applications, Microsoft Office, and Microsoft Expression Studio. Updates are usually provided with the use of an Internet connection, but there is condition for updates to be installed on computers without an Internet connection. Different kinds of updates are the security updates or critical updates which protect against the danger of malware and security exploits; other updates repair errors that are not related to security, or improve functionality. In Windows Vista, there’s an update package file which has a source code to initialize system updates or upgrades, or fixes and patches for the Vista systems. These files are incorporated with the source data collection specifications owned by Microsoft Corporation, and are implemented with standards for the MSU format needed by other Microsoft Window-based systems.

a word of warning

Be careful not to rename the extension on .msu files, or any other files. This will not change the file type. Only special conversion software can change a file from one file type to another.

what is a file extension?

A file extension is the set of three or four characters at the end of a filename; in this case, .msu. File extensions tell you what type of file it is, and tell Windows what programs can open it. Windows often associates a default program to each file extension, so that when you double-click the file, the program launches automatically. When that program is no longer on your PC, you can sometimes get an error when you try to open the associated file.

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