Stop Outlook blocking access to attachments

To stop Outlook blocking access to certain files follow this procedure:

To Add file types to Level1Remove key:

Run Regedit, and go to this key:
HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security (change 10.0 to 9.0 for Outlook 2000 SP3 or to 11.0 for Outlook 2003)

Under that key, 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.