Note These registry setting only apply to Outlook 2002.
Warning Make changes to the Windows registry with caution. If you are not familiar with making changes to the registry, you should make a complete backup of your system before you make changes.
The option to prevent end-user customization of the security settings is controlled by this registry key:
HKCU\Software\Policies\Microsoft\Office\10.0\Outlook
Value: DisallowAttachmentCustomization
When the registry key is present, end-user customization is disallowed. If the key is absent, end-user customization is allowed. The value of the key has no effect.
The registry key to set the exception list contains a semi-colon delimited list of file extensions. The value of the key is as follows:
HKCU\Software\Microsoft\Office\10.0\Outlook\Security
Value: Level1Remove (REG_SZ)
For a list of Level 1 files, see Block Extensions. For example, to remove .chm, .bas, and .wsh from the list of Level 1 files, enter the following value in Level1Remove (do not enter the period in front of the extension):
chm;bas;wsh
If the value is formatted incorrectly, the restrictions are ignored.