1) You should be able to shift click multiple files (though you'd have had to convert each folder separately). Thus massively speeding up the process. 2) String extension = f.getName().substring(f.getName().lastIndexOf(".")); <-- chance is that if you have files without a "." in them "craftbukkit" instead of "craftbukkit.sh" etc this will die... but I hadn't come across the problem before because I don't have any... so yes, this could be a bug. 3) If you can zip (any compressing is fine) up the files and send them to me TODAY I can try and convert them for you. After that I'm gone for a few weeks. Otherwise I'd try and ensure that wherever the file browser first launches has no files with no extension and you jump straight to the directory with the files. If you don't get the files to me I'll try to have fixed the bug. It shouldn't be hard... but I'd messed with the source so I may have broken it elsewhere... plus I'm very busy today before I leave.