EPK files, short for "Eagler Pack" files, are a type of archive file used by Eaglercraft to store and manage server data, configurations, and plugins. In the context of Eaglercraft 1.5.2, EPK files play a vital role in customizing and extending the functionality of your Minecraft server. These files contain a collection of files and folders that are used to configure server settings, install plugins, and manage user data.
Because Eaglercraft runs entirely on client-side JavaScript and WebAssembly, it cannot read standard .jar files or traditional Minecraft resource packs. Instead, the community developed the format to package assets. eaglercraft 152 epk files