Unblock or Allow Microsoft Access Databases and Other File Attachments in Microsoft Outlook
Provided by: Molly Pell, Technical Project Manager
Outlook Blocks Certain File Types as Attachments
Is Microsoft Outlook preventing you from receiving files people are trying
to send to you? Adding a registry value bypasses this security feature.
All versions of Outlook later than Outlook 2000 SP2 disallow you from
opening certain file types, such as .mdb, .adp, .exe, .hlp, and more. In
some regards, this is a great security feature, but there are times when you
need to receive these files as attachments. It’s best if the sender can send
a Zip file, but if not, you can create a registry key to un-block the
desired file types.
Use extreme caution when modifying the registry.
Changes to your registry
can render your entire system unusable.
Open the Registry Editor (choose Run from the Windows Start menu, type “Regedit”,
and click [OK]).
Locate My Computer\HKEY_CURRENT_USER\Software\Microsoft\Office\Version\Outlook\Security
(where Version is your version
number of Outlook:
- 9.0 for Outlook 2000
- 10.0 for Outlook 2002
- 11.0 for Outlook 2003
- 12.0 for Outlook 2007
- 14.0 for Outlook 2010
- 15.0 for Outlook 2013
In the Security key, add a String value named “Level1Remove” (without the
Modify the String value, and add the list of file types to allow Outlook to
open (separated by semicolons). For example: ".mdb;.adp;.mde;.ade" (without
Note: Microsoft recommends that you enable only the file types that you
require. If you rarely receive a particular file type, Microsoft recommends
that you give Outlook temporary access to the file type, then reconfigure
Outlook to block the file type by undoing the changes to registry.
http://support.microsoft.com/kb/829982 for more information.
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