To convert launch.bat to an executable, go to this website http://download.cnet.com/Bat-To-Exe-Converter/3000-2069_4-10555897.html
and download the Bat to EXE converter. Open it up and run the exe file. For the "Batch file" field, point to the "launch.bat" file that you created. Then click "compile". You should now see a "launch.exe" file in your "U3Custom" folder.