Knowledge Base

PRB: MFC ActiveX Document Servers Require Compound File Support

Article ID: 166769

Article Last Modified on 11/21/2006

Microsoft Foundation Class Library 4.2, when used with:
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Professional Edition
- Microsoft Visual C++ 6.0 Enterprise Edition
- Microsoft Visual C++ 6.0 Professional Edition
- Microsoft Visual C++ 6.0 Standard Edition

This article was previously published under Q166769

SYMPTOMS

When you save an ActiveX Document that does not use compound files from Internet Explorer functioning as an ActiveX Document Container, the file will be saved in compound document format. Subsequent attempts to load the file in Internet Explorer results in the exception "Unexpected File Format."

Microsoft Binder will not load the document.

CAUSE

The MFC ActiveX Document Server classes normally require compound file support.

RESOLUTION

Add a call to EnableCompoundFile(TRUE) in the document constructor:

   CScribDoc::CScribDoc()
   {
        // ...
        EnableCompoundFile(TRUE);
   }

MORE INFORMATION

Creating a new ActiveX Document server or regular OLE embedding server in AppWizard selects compound file support by default. The assertion problem occurs if compound file support was deselected when the project was initially created.

Keywords: kbactivedocs kblocalsvr kbautomation kbprb KB166769