Document parsers in SharePoint - Office 2003 and 2007 promote-demote differently

Understanding document property promote-demote logic is quite a challenge - at least to me. I still haven't found the great description of how to do it. Input appreciated.

However, this blog describe the concept of setting up property promote-demote. The DocParse.xml file is quite interesting - as Office 2003 and Office 2007 doesn't behave equally for property promotion-demotion. The reason could be this file - as the "doc" extension is not included, and SharePoint maybe for that reason uses another algoritm, thus leading to another result!

From this blog:

WSS includes built-in document parsers for the following file types:

• OLE: includes DOC, XLS, PPT, MSG, and PUB file formats
• Office 2007 XML formats: includes DOCX, DOCM, PPTX, PPTM, XLSX an XLSM file formats
• XML
• HTM: includes HTM, HTML, MHT, MHTM, and ASPX file formats

You cannot create a custom document parser for these file types. With the XML parser, you can use content types to specify which document properties you want to map to which content type columns, and where the document properties reside in your XML documents.