To always allow all types of attachments, you can change this setting in Safety options. After changing this setting, you will be able to download and open all types of attachments; however, changing this setting won't unblock attachments that Mail has already received. To allow these types of attachments for certain messages, you can ask the sender to compress (or zip) an attachment before sending it.
On the Home tab, click Junk, and then click Safety options.
Click the Security tab, and then, under Virus protection, clear the check box next to Do not allow attachments to be saved or opened that could potentially be a virus, and then click OK.
Turning this off may leave your computer at risk from viruses and isn't recommended.
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