I have found the solution for this problem. It actually have something to do with the locale setting of the system you are using. It has to be set to english (US). I fixed this by creating a .bat file in the arduino-1.5.3 catalogue with the following command lines:
cd C:\arduino-1.5.3
java\bin\java -Duser.language=en -Duser.region=US -Xms128m -Xmx128m -classpath "lib;lib\pde.jar;lib\core.jar;lib\jna.jar;lib\ecj.jar;lib\RXTXcomm.jar;lib\commons-exec-1.1.jar" processing.app.Base
where "C:\arduino-1.5.3" is the Arduino IDE location.
This opens up the Arduino IDE. Hopefully this problem will be fixed in future releases of the Arduino IDE for Galileo.