It's named Endless Online in many places throuht the program, using resource hacker you have to make sure that you change one; the internal name, two: product name & three: original name.
Then save and most of it should be what ever you re-named, if it still says Endles Online in few things such as task manager then lastly open your client with hex editor (I use Neo) then find 'endless.exe' or 'Endless Online'. There will be a few I expect if you search 'Endless Online'. But the
best way to be past this is to start with hex before you use resource hacker. It should expell and complications.
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Royal Endless: Were mass programming is taking place, for you! - Comming Soon 2012