Unable to open diagcab files (Vista)

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  To address any future complaints about this question before they occur:

  1. This question pertains to fixit because the program uses diagcab files
  2. I was specifically referred here by a Microsoft support engineer

  From http://answers.microsoft.com/en-us/windows/forum/windows_vista-system/unable-to-open-diagcab-files/e7f8e4e5-b442-4e53-af7a-90e74985a73f:

  Unable to open diagcab files

  Hello,

  I should be able to open *.diagcab files, but currently there is no program associated with this file type. I have run disk check and sfc, but the problem has not been fixed. 

  Maybe someone can post a *.reg file that would simply add the required registry settings. MSDT is installed where it should be; I just lack the registry settings associating *.diagcab files with it.

  If I cannot repair this, I will probably have to complete an in-place repair, which I would very much like to avoid.

  Also, here is a command prompt showing the current state of my registry:

  Microsoft Windows [Version 6.0.6002]

  Copyright (c) 2006 Microsoft Corporation.  All rights reserved.

  C:\Windows\system32>REG QUERY HKCR\.diagcab

  ERROR: The system was unable to find the specified registry key or value.

  C:\Windows\system32>REG QUERY HKCR\Diagnostic.Cabinet /S

  ERROR: The system was unable to find the specified registry key or value.

  C:\Windows\system32>REG QUERY HKLM\SOFTWARE\Classes\.diagcab

  ERROR: The system was unable to find the specified registry key or value.

  C:\Windows\system32>REG QUERY HKLM\SOFTWARE\Classes\Diagnostic.Cabinet /S

  ERROR: The system was unable to find the specified registry key or value.

  C:\Windows\system32>

  Thanks in advance.

  ...

  1) I was trying to open the Microsoft "fix it" file of "windowsupdate.diagcab."

  2) I was having some issues installing updates; however, I have solved these issues and was able to install all available updates. In spite of this, I still cannot open the Microsoft fixit solution, and would like to solve this issue so that next time I have problems I can run the Microsoft fixit solutions.

  3) http://sdrv.ms/Yv28gD

  4) Not any more, since the issues with windows update are resolved, but I would like to allow myself to open these files so that if any future issues arise, I can run Microsoft fixit solutions.

  Thursday, March 14, 2013 11:47 PM