I have several computers synchronized using clouds. My references are spreaded in different directories of various OS. Some directories of them are not in the same relative directories as the .bib file is. For example, my current computer has both Windows and Linux systems installed. I switch to either of them time to time. Could you develop a feature that users can define default path names for different OS/computers, so that the JabRef can judge accordingly to select the right path to link the PDFs. Thanks.