The Developer's Tidbit

January 14, 2008

.MSU Windows Update Standalone Installer missing association / How to open a msu file

Today for some particular reason my version of Microsoft Vista had forgotten what to do with ‘.msu’ files. MSU is a file extension used by Microsoft to package operating system updates that are not tied in with Windows Update.

Fortunately there is a quick and simple solution, but for many people this is not too obvious. We simply need to re-associate the ‘.msu’ extension with the Windows Update Standalone Installer. Thats the application included in Windows and is used to install these packages

Firstly you need to click ‘Select a program from a list of installed programs’ and press OK. The following prompt will then appear.

From here, just select ‘Browse’ and then press OK. Also make sure the ‘Always use the selected program to open this kind of file’ is ticked.

Now browse into your ‘Windows\System32\’ directory and look for the file ‘wusa.exe’, select it and click OPEN.

Now the Windows Update Standalone Installer will be an option within your Open With dialog. Make sure it is selected and press okay.

Thats it, now your .msu packages should be working again as normal.

7 Comments »

  1. Hey thanks a lot buddy :P
    much appreciated!!
    most of the times the simplest of things appear too difficult…

    am a beginner so need all the guidance i can at this stuff :D

    cheers!! n thanks again

    Comment by H.Singhal — January 29, 2008 @ 12:18 am | Reply

  2. No problems, I am glad I could be of some help.

    Comment by Ben — January 29, 2008 @ 7:05 pm | Reply

  3. I was looking for this solution for months thanks

    Comment by SaRRaZin — March 14, 2008 @ 9:57 pm | Reply

  4. This works great for Vista, but what about XP?

    Comment by Daryl — June 12, 2008 @ 11:46 pm | Reply

  5. Windows Update Standalone or MSU files were only introduced into Vista and Windows Server 2008. They are not supported by XP; so no XP updates would be distributed or be used by this application.

    http://support.microsoft.com/kb/934307

    Comment by Ben — June 13, 2008 @ 9:48 am | Reply

  6. in xp,you can use

    expand -f:msufilename destinationfolder

    to extract the msu files. same in w2k3.

    Comment by WoofWoof — June 25, 2008 @ 6:59 pm | Reply

  7. Good old Microsoft strikes again. They make IE8 langauge packs available but apparently you can only install them in Windows Vista. By the way, I tried WoofWoof’s suggestion but I just get an error message saying there are no files to expand.

    Comment by Christopher Goodall Short — October 15, 2009 @ 2:41 pm | Reply


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