This article was previously published under Q224957
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When attempting to debug a Web page that references a DHTML Behavior (.HTC file), the .HTC might not appear in the list of running documents and cannot be debugged through the Visual InterDev 6.0 debugger.
Install Visual Studio 6.0 Service Pack 3.
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.
This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base: