Where is the best documentation of Microsoft Excel Chart Biff format

Question

I am looking for the best documentation of Microsoft Excel's chart file format - 1997 - > 2003.

I am not looking for ooxml. I am not looking for the format of worksheets/workbooks. I am looking for the format of Excel charts.

What is the best resource on the web?

Answer 1

Microsoft published these about a year ago in P A I N F U L detail. Are you sure you don't want to just use the XML formats ? ;-)

Answer 2

Microsoft also published these and the one you want is [MS-OGRAPH].pdf