Occasionally I want to allow some of those attachments which Outlook blocks by default, when I know it’s a trusted installation file for example. Microsoft publishes a list of attachments which are blocked here, for me its usually .exe and .msi files.
There are applications out there that will let you amend Outlook settings using a GUI (OutlookTools is a good free one) but if you aren’t afraid to amend the registry its an easy change to make.
Before showing how to make these changes I would like to say that these attachments are blocked for security reasons, so I would suggest reversing these changes once you’ve received that trusted file (I tend to keep a .reg file to apply the change to allow the common .msi and .exe and then another to revert back to default).
OK, so the process is:
1. Close Outlook.
2. Open the registry editor and locate the following key:
3. Add a new key by selecting Edit > New > String Value and typing Level1Remove and press enter
Double-click this new key (or select Edit > Modify) and type the extensions you wish to allow (include the preceding ‘.’ and seperate multiple values with a semi-colon) as below:
4. Press OK, then close the registry editor
5. Open Outlook and access those trusted attachments