"The file is corrupted and cannot be opened" error message when you open an attachment in Office 2010

Applies to: Excel 2010Microsoft Word 2010PowerPoint 2010

Symptoms


When you try to open a Microsoft Office email attachment in Microsoft Outlook 2010, Microsoft Office 2010 reports a problem with the file, and the file does not open. 

Resolution


If you want to manually set component security settings back to the default settings, follow these steps:
  1. Click Start, type dcomcnfg in the Search box, and then click dcomcnfg in the Programs list.
  2. In the navigation pane, expand Component Services, expand Computers, right-click My Computer, and then click Properties.


    Properties

     
  3. Open the Default Properties tab, and then set the following values:
    • Default Authentication Level: Connect
    • Default Impersonation Level: Identify
    Default Properties



     
  4. Click OK.