Modding old games often feels like an archaeological process.
Among the various Mu-Online files available for setting up private servers, some aspects are particularly challenging to edit. For example, configuring the in-game shop in versions up to S6 is notoriously difficult. Many servers don’t even use it, opting instead for creative workarounds like replacing all the UI and item images with transparent ones to hide the buggy shop. The main challenge lies in the cryptic files required for editing the shop. The server file must match the one embedded in the client and the corresponding web server files, yet they all use different structures, data types, and even names for the same game variables. But struggle no more—here’s a detailed analysis of the file structures for all four components.
The IBSPackage file belongs to the game server, the IBSProduct to the client, and the IGC_ItemCash_List.xml and IGB_ItemCash_Info.xml files to the web server. Since the order of properties in XML files isn’t important, both XML files in the image are aligned by their corresponding elements to match the game server’s IBSPackage file, where order is critical, indicating what each byte or sequence represents. The client’s IBSProduct file, which follows a different order and structure, is depicted outside the main table, connected by arrows to its corresponding elements.
The rest should be clear if you’re already deep into the rabbit hole of pirate legit Mu servers…
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