Unblocking Outlook attachments


     Before I tell you how you can still access those attachments you must realize that you are creating a security risk on your computer this way. A good practice is to send these files in a compressed (for instance zip or rar) format. This enables you to scan the file before unpacking and it will also take less inbox space and upload/download time!

To enable receive blocked attachments involves changing the registry. I strongly recommend to only edit the registry when you actually receive a blocked attachment and there is no other way in getting that file again in a safer way (in compressed format) and you know for sure that the file is clean. Also, change back the registry directly after you saved the attachment. It probably sounds paranoid but you’ll be hitting yourself if you get infected because you "opened the door and invited the virus" yourself.

Alright, here goes;

  1. Make sure Outlook is closed.
  2. Open your registry editor by opening the Run command and type regedit (regedt32 for Windows 2000).
    In Windows Vista and Windows 7 you can also directly type regedit in the Start Menu’s Search box.
  3. Locate the following key
    • Outlook 2000
    • Outlook 2002
    • Outlook 2003
    • Outlook 2007
    • Outlook 2010
  4. Go to Edit-> New-> String Value and name the value Level1Remove (case sensitive!)
  5. Double-click on the newly created value and enter the extension including the "dot" that you want to open in Outlook. For instance .exe
    If you need to enter more than one extension you’ll have to type separate them by a semicolon like this; .exe;.bat;.url
  6. Press OK on the input box and close the registry editor
  7. When you open now Outlook, the attachments which hold those extensions aren’t blocked by Outlook anymore.

To let Outlook block those extensions again follow the instructions again but instead of creating the Level1Remove value delete it.

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