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Implements CFBF detection for legacy Office formats (.doc, .xls, .ppt)
This adds proper file type detection by:
Supports Word 97-2003 (.doc), Excel 97-2003 (.xls with 2 CLSID variants), and PowerPoint 97-2003 (.ppt) with correct MIME types. The CLSID-based approach can be easily extended to support other CFBF formats like .msg, .msi, or .vsd in the future.