[Zope] Problems opening a visio file

[TANNERT,CARSTEN (HP-Germany,ex1)]

Hello, 
I uploaded a visio file to the web. When I want to open it, I have to login
to Zope. Why ? 
All Word-or Powerpointfiles open without logging in. 
Can somebody help me with this?
Is is an IE problem or a property in Plone that I have to change? 
 
Thanks in advance for your help.
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