It seems that "LibreOffice 3.4.3 RC2 - WIN7 Home Premium (64bit) German UI [OOO340m1 (Build:302)]" still does not have FLAT XML support, while other OS support this format since 3.3. It's difficult to accept that, and it's very bad that these differences nowhere are mentioned in Help and Documentation, and it's also very bad that FLAT XML so nowhere in Help or documentation is mentioned. - Reported with Bug Submission Assistant -
I did a Repair of my Installation, but I did not find anything looking like FLAT XML Support in the "Additional Components"
Created attachment 51330 [details] Screenshot, pls. see original report!
Concerning FlatXML nonsense, I simply did not know that xslt have to be installed. I will check PDF problem with next Master and file a separate bug if necessary.