While many people want to unblock file types that are blocked by Outlook's security, with recent viruses using the zip file type to propagate, you may want to block zips to prevent someone from opening zips accidentally.
Choose between two options:
Level1Remove -- slow down access to the zip by forcing users to save them to the hard drive before opening them. With this enabled, users will be presented with a dialog like the one shown here when they double click on an attachment.
Level1Add -- treat *.zips like *.exes to completely block access to them.
Level1Remove
To Add file types to Level1Remove key:
- Press windows key + R to open the run command. Type Regedit and press enter to open the registry editor.
- Browse to the appropriate key for your version of Outlook
- Add a new String value named Level1Remove.
- For the value for Level1Remove, enter a semicolon-delimited list of file extensions. For example, entering this: .zip;.mdb;.url; would force you to save Zip file type and unblock Microsoft Access files and Internet shortcuts.
Outlook 2016
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Outlook 2013
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Outlook 2010
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Outlook 2007
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Outlook 2003
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Outlook 2002
HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Outlook 2000
HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
String: Level1Remove
Value: .ext;.ext; format
Level1Add
To Block file types using the Level1Add key:
To add additional attachment file name extensions types that you want blocked, you must add the Level1Add key to the registry. To do this, follow these steps.
- Run Regedit browse to the appropriate registry key for your version of Outlook.
- Add a new string value named Level1Add.
- For the value for Level1Add, enter a semicolon-delimited list of file extensions. For example, entering .zip would treat the Zip file type like exe's and block access to them.
Outlook 2016
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Outlook 2013
HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Outlook 2010
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Outlook 2007
HKEY_CURRENT_USER\Software\Microsoft\Office\12.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Outlook 2003
HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Outlook 2002
HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Outlook 2000
HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
String: Level1Add
Value: .zip;.pdf; format
Tools
Use Advanced Security for Outlook to learn what programs are trying to access Outlook and permanently allow or deny access to the program and the next time it requests access, the action you choose will be automatically executed and Outlook Security will not annoy you with messages about trying to access e-mail addresses you have stored in Outlook. Freeware, available in English, German and Russian. Advanced Security is fully compatible with Windows 8 (32-bit and 64-bit editions) and Microsoft Office 2013 (32-bit editions only). The programs button is available on the ribbon in Outlook 2010 and Outlook 2013. |
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COM add-in by Outlook MVP Ken Slovak that adds an Attachment Security Options page to the Tools, Options dialog in Outlook 2000 SP3 or higher to allow you to manage which file attachments are blocked. New version adds support for the .gadget extension for Outlook 2003 SP3 and Outlook 2007 SP1. It also adds detection for those SP levels. Shareware. Version 1.9.6 |
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"Outlook blocked access to the following potentially unsafe attachment ..." If you get this message when attempting to access an Outlook email attachment you'll want to install Attachment Security for Outlook; a free program for unlocking attachments blocked by Outlook. Attachment Security for Microsoft Outlook is a free and easy to use software program that allows you to open attachments blocked by Microsoft Outlook e-mail security. |
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Use CodeTwo Attach Unblocker to configure Microsoft Outlook to allow the openig of the attachments blocked by default (for example, .exe, .url, .reg). The program is an Outlook extension; its settings are available at the property sheet in the Outlook options, which ensures quick and convenient editing. Supports all versions of Outlook, including Outlook 2010 64-bit |
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CodeTwo Outlook WarningDoctor removes the security warnings that appear when sending mail or performing other actions recognized by Microsoft as a "risky" (for example, when you try to read some data using the Outlook or CDO API #. Especially useful for designers of macros, Visual Basic, and programmers of other scripting languages that use the object model.Outlook 2000 and up, including Outlook 2010 64bit. |
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Free tool for setting up how Microsoft Outlook block (or not) e-mail attachments. Get rid of the message "Outlook blocked access to the following potentially unsafe attachments". Beta |
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4 Comments on "Block Additional File Types in Outlook"
There is not actually an "other list" - it's just all of the extensions not blocked as unsafe. Unless things changed in a recent update, the extensions are NOT case sensitive - you should use lower case.
FWIW, Office files shouldn't be blocked. If the check box on the open or save dialog is turned off, open outlook using run as administrator and open the file - you'll be able to tick the checkbox to never ask again. More info: https://www.slipstick.com/problems/disable-always-ask-before-opening-dialog/
this page keeps re-loading in internet explorer. please fix
What version of IE are you using?