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Outlook enforces two file attachment security
levels by default. Any file attachment that belongs to a Level 1
file extension is blocked and can't be viewed or programmatically
accessed by a recipient. Additionally, if you try to send e-mail
messages programmatically that contain Level 1 file attachments,
Outlook will warn the user that recipients may not be able to view
the attachments; there is no way to avoid this warning, even with
customized security settings.
Any e-mail message that contains a Level 2 file
attachment prompts Outlook to ask users to save the file attachment
to their hard disks. Level 2 file attachments cannot be opened
directly from e-mail messages. If you use Outlook in conjunction
with Microsoft Exchange Server, your network administrator can add
and remove specific Level 1 and Level 2 file extensions. (see
picture 1).
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| Picture 1
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It is possible for administrators to prevent you from opening
certain file types even if you use this addin. We recommend
checking with your system administrator if your attachments still
do not show up after installing the addin.
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