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Microsoft KB Archive/170053

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Knowledge Base

Netscape Was Unable to Find a Plug-in for Application/octet-stream

Article ID: 170053

Article Last Modified on 6/23/2005


  • Microsoft Internet Information Server 2.0
  • Microsoft Internet Information Server 3.0

This article was previously published under Q170053

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:


When you use the Microsoft PowerPoint Animation Player with Netscape clients, you may get the following error message:

Netscape was unable to find a plug-in for


If you use Netscape Navigator, the Web server must send the PowerPoint Animation files as a special type of file to avoid the above error message.


Ask your server administrator to add the following MIME mapping to the server:

.PPT -> application/mspowerpoint

.PPZ -> application/mspowerpoint

.PPS -> application/mspowerpoint

.POT -> application/mspowerpoint

If you use the Microsoft Internet Information Server (IIS), add the following registry entries on your server:



For more information about adding MIME mapping, refer to the documentation for the particular server being used.

The third-party products discussed here are manufactured by vendors independent of Microsoft. We make no warranty, implied or otherwise, regarding performance or reliability of these products.

Keywords: kberrmsg kbinterop kbprb kb3rdparty KB170053