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Any - Outlook 2000 SP3+ - Unblock attachments by extension

Any software title released for Windows. Articles are posted in "Windows Version - Software Title - Subject" format.

Any - Outlook 2000 SP3+ - Unblock attachments by extension

Postby lmmtux » Wed Aug 15, 2012 9:07 am

By default, Outlook blocks many attachment types for security reasons. But sometimes, we want to allow certain attachment types.

Note: This fix only applies to Outlook 2000 SP3 and higher.


  1. Open the Registry Editor as the user you wish to change this setting for (regedit.exe)
  2. Navigate to the key: HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
  3. Change 10.0 to reflect the version of Outlook you are using:
    • Outlook 2000 SP3 : 9.0
    • Outlook 2002 : 10.0
    • Outlook 2003: 11.0
    • Outlook 2007: 12.0
    • Outlook 2010: 13.0
  4. Create a String value called "Level1Remove"
  5. Enter in the list of extensions you want Outlook to allow separated by semi-colons. For example:
    Code: Select all

    This example will allow Microsoft Access and Internet Shortcuts.
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