Block Additional Attachment Types

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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. 

Level1Add -- treat *.zips like *.exes to prevent access to them.

Level1Remove

To Add file types to Level1Remove key:

1. 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, 12 for Outlook 2007)
2. Under that key, add a new string value named Level1Remove.
3. 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.

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