Depending on the security policy in place at your site, some types of file attachments may not be viewable in your mailbox. You may see the paper clip link pointing to a file attachment, but you will not be able to open the attachment.
Your system administrator can set the following attachment blocking options:
Select which type of files can be opened. For example, view attachments if they can be converted to HTML (e.g., Word, PowerPoint, PDF, Excel, or text documents) but not image files, ZIP files, or executable files.
View all attachments, regardless of file type
This is not the same as rejecting all attachments, which typically blocks delivery of messages that may contain viruses or other unacceptable content.
If you receive an email attachment that you cannot open, contact your system administrator.