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(PDF Files) https://pdfbox.apache.org/
(Bridge to OpenOffice) https://code.google.com/p/jodconverter/
(MIT Scratch files, slightly modified to allow use as included library) http://scratch.mit.edu/forums/viewtopic.php?id=191
(MIME Type detection) http://aperture.sourceforge.net/
(MIME Type detection of MS Office files) https://poi.apache.org/
(Logging ...) https://logging.apache.org/log4j/