How to edit the Main, login screen and client resolution
Complete guide to customizing a MU Online private server client: what the Main.exe controls (server connection, client behavior, texts), the two methods for changing the server IP in the client (config file vs hex editor), how to use HxD to safely hex-edit Main.exe and replace the hardcoded IP, how to change the login background image (correct file format, dimensions, and location by season), how to edit the WTF file and text files to customize in-game messages and item names, how to fix broken accent characters (locale setting, font files, encoding), how to configure the client resolution for modern widescreen monitors, a full list of tools you need for client editing, and the safety checklist before distributing a modified client.
