I was afraid so, but was hoping there would be a workaround to use an underlying macro or the MS XML format to use a script or an XML filter to do the extraction. I.e. at the worst, if the file has some sort of text format equivalent with markup, something like sed could have been used to trawl through the text looking for identifiers. Oh, well, back to LibreOffice, but I am afraid it will be hard to convince my employer to mandate it's usage globally...