You receive an error message when you try to open a file type that was blocked by your registry policy settings in Word 2010, in Word 2007, or in Word 2003

You receive an error message when you try to open a file type that was blocked by your registry policy settings in Word 2010, in Word 2007, or in Word 2003

http://support.microsoft.com/kb/922849#w2003

RESOLUTION

Use a trusted location, or create an exempt location

To do this, follow these steps, as appropriate for the version of Word that you are running:

• In Word 2010, if you trust the file that you want to open, you can open that file even if the file type is blocked by the registry. You can override the registry policy settings by moving the file to a trusted location.
  
  For more information about how to create, to remove, or to change a trusted location for files, visit the following Microsoft Web site:
• In Word 2007, if you trust the file that you want to open, you can open that file even if the file type is blocked by the registry. You can override the registry policy settings by moving the file to a trusted location.
  
  For more information about how to create, to remove, or to change a trusted location for files, visit the following Microsoft Web site:
• In Word 2003, there are no trusted locations. You can create an exempt location to override the registry policy settings. To create an exempt location, follow these steps:
  
  Click here to view or hide detailed information
  
  

  1. Exit Word 2003.
  2. Click Start, click Run, type regedit in the Open box, and then click OK.
  3. Locate and then click one of the following registry subkeys:
     HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Common
     HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\11.0\Common
  4. Point to New on the Edit menu, and then click Key.
  5. Type OICEExemptions for the name of the key.
  6. Point to New on the Edit menu, and then click String Value.
  7. Type a string name, and then press ENTER. For example, type ExemptDirectory.
  8. Right-click the string name that you typed in step 7, and then click Modify.
  9. In the Value data box, type the path of the directory that contains the file, and then click OK. For example, if your document is in the C:\My Documents folder, type C:\My Documents in the Value data box.
     
     Note You must create the folder. Any subfolders are not automatically exempted. For any additional folders that you would like to make exempt, repeat steps 6 to 9 by creating string values such as "ExemptDirectory1," and "ExemptDirectory2."
  10. On the File menu, click Exit to exit Registry Editor.