Interesting, these latests specs are much more verbose than the ones released in February 2008. For example, the XLS spec is now about 40 MB vs 5 MB in the February's edition!
The link to MSDN is http://msdn.microsoft.com/en-us/library/cc313105.aspx
However, you also mentioned generating ppt files. ppt graphs and excel graphs are quite different beasts. Yegor might be able to advise you on what is and isn't supported by hslf in this area.
I confirmed that [MS-OGRAPH].pdf covers the binary format for ppt graphs. It looks quite feasible to implement, although it would take more than a week.
The funny thing is that the formats of ppt and xls graphs are very similar. Both follow BIFF conventions - 4 byte header, Continue, EOF/BOF records, etc. The main difference is that in ppt graphs are stored in a separate OLE stream while in xls it is embedded right in the workbook stream. So, the code base should be common and reusable across POI sub-projects.
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