Het antwoord :
http://support.microsoft.com/support/kb/articles/Q284/4/14.ASP
OL2002: Recipient Cannot Open E-mail File Attachment; Error Message Describes It as 'Potentially Unsafe'
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The information in this article applies to:
Microsoft Outlook 2002
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SYMPTOMS
When you send a message that contains a shortcut to a file, by right-clicking the original file, dragging the file to the Inbox folder in Outlook, and clicking Send with Shortcut, the recipient receives the following message in the info box of the e-mail message:
Outlook blocked access to the following potentially unsafe attachments:
CAUSE
This behavior is by design. Creating a shortcut by this method does not create a .lnk file. An attachment like this is a Level 1 file attachment and is considered potentially harmful.
WORKAROUND
To work around this issue, create a shortcut to the file in the resident folder, and then attach that shortcut to the message.
MORE INFORMATION
Outlook blocks access to this kind of attachment so that the recipient is unable to open it. However, if you drag an existing shortcut for the same kind of file into a message and then send the file, the recipient may be able to open the file.
Microsoft has classified dozens of file types as being Level 1 security risks, including files with .mdb, .mde, .ade, or .adp extensions.
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
Q290497 OL2002: Cannot Access Attachments
Additional query words: blocked prevent attachment shortcut link