Hi Michael, thanks for your reply! With the following links I figured out how to get and set the properties of office documents like author, title, comment or company: http://support.microsoft.com/kb/186898/en-us[^] http://msdn.microsoft.com/library/default.asp?url=/library/en-us/stg/stg/the_documentsummaryinformation_and_userdefined_property_sets.asp[^] So the first (and minor point) on my list of wishes is done. But as far as I can see I cannot edit the major metadata of office document's like track changes, hidden text, deleted text or previous versions with the IPropertyStorage interface. Check out for example the ezClean[^] tool that does all this pretty stuff. Does anybody have a clue how to do this? Regards, mYkel