"Open With" Command Missing from the Context Menu

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Article ID: 218805 - View products that this article applies to.
This article was previously published under Q218805
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SYMPTOMS

When you double-click an unknown file type, an unexpected default action may occur.

When you right-click an unknown file type, the Open With command may be missing from the context menu that appears.

CAUSE

This behavior can occur if the registry key that handles the command is altered or damaged.

RESOLUTION

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

Use Registry Editor to examine the file association key for unknown file types:
HKEY_CLASSES_ROOT\Unknown\shell\openas\command
The "default" value for this key should read:
C:\%windir%\rundll32.exe shell32.dll,OpenAs_RunDLL %1
If necessary, modify the value to match the value shown here.

MORE INFORMATION

For additional information about how to determine which folder Windows is installed in, click the article number below to view the article in the Microsoft Knowledge Base:
305792 How to Determine Which Folder Windows Is Installed In

Properties

Article ID: 218805 - Last Review: January 24, 2007 - Revision: 1.3
APPLIES TO
  • Microsoft Windows 95
  • Microsoft Windows 98 Standard Edition
Keywords: 
kbenv kbprb kbui KB218805

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