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Microsoft Outlook by default blocks certain file types from directly opening, this done to enhance the security of the Outlook. Various file types are defined in Outlook as safe and unsafe, the unsafe attachments cannot be opened where as the safe attachment file types can be opened. There is no direct option provided in the Outlook to manage the safe and unsafe attachment file types, but you can easily control or manage the safe and unsafe file types using the Outlook Attachment Enabler which is a free software.

Outlook Attachment Enabler displays the full and complete list of what Outlook will block by default, if you intend to mark a file type as safe then just select the entry and use the ‘Mark as safe’ option in the bottom of the screen to add it to safe list. This tool is must have if you are a heavy Outlook user. This works with Outlook 2000, XP, 2003 or greater.

Download Outlook Attachment Enabler