All you have to do (at least what I've done to get it to work) is perform the following steps:
1. Get the latest version of Java Installed (It looks like you have this taken care of. *Check*)
2. Extract BrowEdit 2.0 r87 onto your desktop
3. Rename settings.Borf.json to settings.yourcomputername.json
e.g) If my PC name was Syouji-PC then I would put settings.Syouji.json (assuming you're running Windows 7)
4. Open the settings.yourcomputername.json with notepad or notepad++ or any other text file editor.
5. Inside add the directories to your data.grf (rdata isn't required) and your RO directory.
This is what I put inside mine.
{
"readini" : false,
"ini" : "",
"grfs" : [ "C:/Program Files (x86)/CookieRO_V3/data.grf"],
"readdata" : true,
"datadir" : [ "C:/Program Files (x86)/CookieRO_V3/data.grf", "." ],
"inversecamera" : false
}
6. Double-click on "Run.bat" to run BrowEdit 2.0. If all goes well, it will auto-load Prontera.rsw and you should be able to see the map just fine. If you don't see the map, then your video card probably doesnt support the correct version of OpenGL that BrowEdit 2.0 uses for rendering. Any video card before 2010 is considered obsolete and potentially incompatible.
Note: Do NOT touch the browedit_lib folder or browedit jar file. Leave those alone. Only focus on what I've stated above. The "Run" bat file is looking for the following location to run BrowEdit with Java:
c:\Program Files (x86)\Java\jre7\bin\java.exe
If the directory and executable file doesn't exist, I would check again to getting Java 7 installed.