When you run a.msu file, the Windows Update Standalone Installer (wusa.exe) extracts the package contents to a folder and reads the Windows Update metadata to search for available updates for your computer. Install cab and msu updates. Let's say; your system has a more recent update already installed, or the update. There is this link on microsoft support site that explains how to install the.msu file: Description of the Windows Update Standalone Installer in Windows.

Each MSU file contains four elements: • Windows Update, which describes the update package • One or more files that store the update data for the package • An file which describes the contents of the MSU file • A properties file that is read by Wusa.exe You can manually extract the contents of an MSU file at the Windows command prompt by typing: expand -f:* 'example.msu' output_directory You can then manually install the update package by typing the following command: pkgmgr.exe /n:output_directory example.xml ( example.msu and example.xml have the same filename prefix). NOTE: Earlier versions of the Windows operating system used files for updates.

Note: The following message was originally posted by an unknown forum member on, but was flagged as spam. I'm manually reposting it here to make it available to everyone. [First a hearty thank-you for this amazing utility. It is indispensible. Much, much thanks to you for your generosity in making it available to others.] I discovered this problem with.msu files when I was trying to install Microsoft Virtual PC.

I went to the Virtual PC homepage, downloaded Windows6.1-KB958559-x64.msu, clicked on it, and Microsoft Word tried to open it. When I uninstalled Word, and tried again, another incorrect program tried to open the file (HTML-Kit. Download Wifi Drivers For Dell Inspiron 15 3000 Series there. exe). So, the assocation of.msu extension with the wusa.exe, the Windows Updater stand alone executable, had been altered somehow.

I did allow changes to file associations during installation of uniextractor, so I presumed this was the source of the change to.msu files in my case. This is just a note to inquire whether installation of uniextractor alters.msu file associations such that clicking on those files no longer launches Windows updater program (wusa.exe) to install them. I don't know for certain, but it seems likely to have been the cause in my case, so I thought I'd post this query here. Note that to fix this problem behavior for.msu files, you simply resore its association with the Windows utility, 'wuse.exe', located somewhere in your Windows folder. In my case the correct folder was Windows SysWOW64 wusa.exe. I'm not sure where this file is located in other versions of Windows, but you can always locate it before doing the steps below, by searching for 'wusa.exe' in the Windows search box.

1) Right-click on top of any.msu file (for example, the Virtual PC.msu file downloaded from Microsoft--search google for the Microsoft link to the 'Virtual PC' or 'XP Mode' homepage) 2) Choose 'OPEN WITH.' 3) In the navigation box that pops up, make sure the 'Always Open with' checkbox is CHECKED 4) If 64-bit Windows if your operating system, navigate to Windows SysWOW64 wusa.exe. Select that, and click OPEN in the navigation box's bottom right corner. 'wusa.exe' stands for Windows-Updater-Stand-Alone executable.

Yes, it can alter the association of MSU files. However, by default it should only associate itself with filetypes that are not currently associated with other programs.

If MSU files are supposed to be associated with wusa. Driver License Template Photoshop Free. exe (which I'm not familiar with - I still develop on XP), then that association should not have been overwritten unless the 'Force association with with all supported archive formats' option was enabled during installation. Can you tell me if that was the case? If so, I'll need to investigate as this could be a bug. Thanks for pointing this out, as well as providing a fix for others that may encounter this problem.

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