In the response to the post “Entry preview layout files”, http://discourse.jabref.org/t/entry-preview-layout-files/429 Christoph Siedlerchr wrote “If you have a custom CSL style which is not avaiable online, you can manually put in the JabRef.jar root. For this, you have to open the jar file with 7zip or a similar archiver and put the file into it.”
Not being familiar with Java, I’m hoping for the next step here. Having unziped the Jabref.jar, what do I need to do to return it to working order. I tried simply zipping all the unarchived files into a zip file which I then renamed JabRef.jar (replacing the original one), but this lead to error messages when I next tried to launch JabRef.