C2AttachmentsUnblocker is a free Microsoft Outlook add-on that allows you to unblock default blocked (for security reasons) mail attachments with extensions such as .exe or .reg. Microsoft Outlook since 2000 Service Pack 2 version does not allow to process some types of attachments for security reasons. These are attachments considered to be potentially dangerous, which may contain a virus or cause damage to the system.

Such attachments can neither be opened nor saved to disk, they are also deleted when you try to forward a message. C2AttachmentsUnblocker is installed as an additional tab in the Tools menu options, where you can easily add or remove individual file extensions that are not to be blocked.