Archive (ERP) edits

ERP operations describe changes to artwork and other resources in .erp archives. List these files in operations.erp in your manifest.

The current builder skips ERP operations. This is the format for the planned build step.

Example

{
  "schema_version": 1,
  "ops": [
    {
      "op": "replace-resource",
      "erp": "2025_asset_groups/ui_package/screens/fe_loading.erp",
      "resource": "eaid://ui_package/art/textures/loading/background.tif",
      "fragment": 0,
      "source": "erp/background.tif"
    }
  ]
}

The resource name above is an example. List the real names with:

python3 tools/erp.py <archive> '*'

erp paths are relative to the game folder. source paths are relative to your mod folder.

Operations

Operation	Fields	Purpose
replace-resource	erp, resource, fragment, source	Replace one part of a resource; fragment defaults to 0
add-resource	erp, resource, type, sources	Add a resource, with one source file per part
copy-resource	from_erp, erp, resource	Copy a resource between archives
remove-resource	erp, resource	Remove a resource
add-mipmaps	source, target	Copy texture files to a game-relative path

For menu changes, see UI patches. For the archive format, see ERP archives.