To work with EPK files, you need specific tools developed by the Eaglercraft community (LAX1DUDE and ayunami2000).
In Eaglercraft 1.5.2, EPK (EAGPKG) files are a custom package format used to store and transfer game assets like world saves and resource packs. These files allow you to export worlds from your browser's local storage to a standalone file that can be shared or imported into other Eaglercraft clients. How to Create an EPK File Eaglercraft 1.5.2 Epk Files
For advanced users looking to create custom resource packs or edit game files, the standard EPK format is not directly editable. You must use specialized tools: To work with EPK files, you need specific
: Standard Minecraft .zip world saves can be converted by importing them into Eaglercraft as "Vanilla Worlds" and then immediately exporting them as EPK files . How to Create an EPK File For advanced