Hello Dave,
Unfortunately, I am afraid no solution for Excel 2003 and PowerPoint 2003.
1. PowerPoint 2003 does not support XML file format. As far as I know, only
a few of Office 2003 applications support XML file format, for example,
Word, Excel, InfoPath, Visio. As to these applications, we can find their
schema from this download link,
http://www.microsoft.com/downloads/details.aspx?FamilyId=FE118952-3547-420A-
A412-00A2662442D9&displaylang=en
PowerPoint 2003 is not one of them. We can also know this from the
PowerPoint product. When we click the Save As command in PowerPoint, we
cannot find any XML file format option in the SaveAs type combobox.
2. Excel 2003 support XML file format indeed, and we call it SpreadSheetML.
But it only supports basic text and table, not picture, chart, objects. If
we want to save a workbook that includes pictures into Excel 2003 XML
format, we will see the following error, and the picture is ignored in the
saved workbook,
----------------------------------------------------
The following features from your workbook will not be saved in the XML
Spreadsheet:
* AutoShapes, other objects, or charts
* VB project
Do you want to continue saving as an XML Spreadsheet?
----------------------------------------------------
This is documented in
http://support.microsoft.com/kb/287739
I understand the concern here. But as product feature is designed and
implemented as this, I think maybe you can consider support XML in your
Addin from Office 2007. That version is based on OpenXML format standard.
Most of the features are available.
Hope this clarifies! Have a nice day Sir!
Best regards,
Ji Zhou
Microsoft Online Community Support