If Warn when opening items that contain blocked attachments is checked, a warning message box will appear when you open any Outlook item with an attachment in the list of blocked file types. Click the Block Extensions button to modify the list of attachment file types that cause ZipOut to display the warning message. Answer Yes to continue to be warned about the attachments in the item or No to suppress the warning message. An attachment warning message box is shown below.
Caution If you are in doubt about the attachments in an item, you should run a virus scan on the attachments in the item or delete the questionable attachments. If an attachment is questionable, do not double-click the attachment to open it. Virus writers often depend upon a script that executes automatically when you open the attachment.