toPath not working in windows

graylog2 server won't start under windows with the following error.

java.nio.file.InvalidPathException: Illegal char <:> at index 4: file:\C:\Program Files\graylog2-server\graylog2-server.jar!\blacklist.drl.

Have changed the .toPath(); -> Paths.get(builtinRuleUrl.toURI());