posted 13 years ago
The office 2003 XML formats consist of an actual XML file - so trying to parse it (and not getting an exception) would indicate that it is in XML format.
Are people still using that format? My impression was that the Office 2007 format (which is a ZIP file) was now mainly being used, if not still the old binary format.
I don't think anything that handles the binary Office formats will be able to be called "light-weight" - it's quite a complex format.