HOW TO CHANGE RESOLUTION IN MUONLINE.US ?
Open MuOnline.Us S12 Folder, try to find the file name "LauncherOption.if" and open it by using Notepad. You will see like this:
As you can see from the picture:
DevModelIndex means your resolution. You can replace the number to change your resolution. Here is the list resolution based on number
WindowMode means play game in fullscreen or window mode. You can replace number to change your mode (window for fullscreen)
1: Window Mode
ID means your account
After config, you must save the file then open main.exe to enjoy it.