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What is vti_bin/owssvr.dll?

Question:
I see users requesting _vti_bin/owssvr.dll in my web statistics logs. What is this?

This file is part of Microsoft Office Server Extensions (OSE). It is accessed when a user visiting your site has Microsoft Office and Internet Explorer installed and has enabled the "Discuss" toolbar.

When the toolbar is enabled, the browser automatically checks the file on your server to see if the OSE extensions are installed, and if it supports web discussions.

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