Extract and View Contents of Microsoft Update Standalone Package (MSU) for Windows Vista

Microsoft Update Standalone Package for Windows Vista is a file with .msu extension that used to deliver Windows updates (security updates, critical updates, updates, update rollups or hotfixes) or downloadable setup package such as Windows DreamScene and Ultimate Extras to the Windows Vista system. If you have downloaded an Microsoft Update Standalone Package (MSU) file to any system running Windows operating system, you cannot easily view the contents of the archive or extract the files from the MSU, as it’s a “IPD-aware” package that contains .cab file that uses Intra-Package Delta (IPD) compression technology.

For MSU file, you cannot use the /x command-line switch at a command prompt to extract the file on a Windows Vista-based computer. Doing this will result in a dialog box that contains command-line help for the MSU opens and lists out. And you can’t open the .msu file on a computer that is not running Windows Vista too, as MSU packages for Windows Vista use a file name extension that is not recognized by earlier version of Windows. Doing this will instead cause Windows to prompts you to locate the program that created the file in order to open it. You cannot use Windows Explorer or WinZip to unzip or extract or view the MSU’s contents too, as only binary delta files are extracted (i.e. _manifest_.cix.xml, 0, 1, 2).

Microsoft provides a resolution where you can unpack or extract the contents and files from .msu package. To resolve this issue, use the Windows Vista Expand command to extract and to view the files in an MSU. The Vista Expand command is included in Windows Vista and in the Windows Vista OEM Pre-installation Kit (OPK), which is different from the Expand command that is included in earlier versions of Windows.

To use the Windows Vista Expand command to expand the files from the MSU, follow these steps:

1. If you are extracting a hotfix package, follow these steps:
   1. Double-click the Hotfix.exe file.
   2. In the Microsoft Self-Extractor dialog box, click Continue.
   3. In the Select the folder where you want to unzip the files to box, type C:\MSUFolder, and then click OK.

   If you are not extracting a hotfix package, create a folder that is named C:\MSUFolder, and then save the MSU file to this folder.

2. At a command prompt, type the following commands. Press ENTER after each command.
c:cd c:\MSUFolder

   expand -F:* Saved_MSU_File_Name.msu c:\MSUFolder

   expand -F: Saved_MSU_File_Name.cab c:\MSUFolder

The C:\CABextract folder now contains subfolders. Examine the files in the subfolders to determine which files are updated by the MSU.

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This entry was posted on Thursday, February 15th, 2007 at 12:29 am and is filed under Windows Vista. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.