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When you run a search in a SharePoint site, the search results randomly do not show the correct icons for Microsoft Office documents or for user-defined document types in the Docicon.xml file. These documents are represented by the general HTML icon _layouts/images/html16.gif instead of the user-defined document type-specific icons. Running Iisreset.exe resolves the problem temporarily.
To resolve this issue, apply both of the following updates:
970946 Description of the Windows SharePoint Services 3.0 Cumulative Update Server Hotfix Package (Sts.msp): June 30, 2009
970948 Description of the SharePoint Server 2007 Cumulative Update Server Hotfix Package (Coreserver.msp): June 30, 2009
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.