} else if(path.startsWith("file:")) {
            String filePath = path.substring(5, path.indexOf("!"));
            String internalPath = path.substring(path.indexOf("!") + 2);

            if (!new File(filePath).exists()) {
                throw new FileNotFoundException(path);
            }

            JarFile jf = new JarFile(filePath);
            ZipEntry zf = jf.getEntry(internalPath);

            if(zf == null) {
                throw new FileNotFoundException(path);
            }

            InputStream is = jf.getInputStream(zf);
            // FIXME: don't use RubyIO for this
            return new ChannelDescriptor(Channels.newChannel(is), RubyIO.getNewFileno(), flags, new FileDescriptor());