Research Brief Dlc Primary

Research Task: DLC-/Patch Container and Priority

Goal: Determine clearly whether a dedicated DLC-/Patch container can be mounted as the primary source for a map/asset group, instead of merely existing as a refchunk alongside a Base Chunk.

Context:

• Custom dlc_4 is recognized by the game (found dlc id 4, SearchDLC: found 4 dlcs).
• An additional Base refchunk 26 was successfully mounted but lost against Base chunk_1 due to identical (type,name).
• This refutes only this Refchunk path, not necessarily a primary DLC-/Patch path.
• Do not start; do not modify Steam files.

Investigate: Existing packagemapspec.json, packagechunklist.json, DLC layouts, patch_N structures, and local tools/documentation. Search for specific fields (basechunkid, layer, patchlevel, Mapspec entries, Chunk IDs) and derive possible, testable primary paths.

Acceptance:

• Exact examples from Retail files with paths/fields.
• Statement of what is thereby secure and what requires a controlled single test.
• No changes except an optional custom report re_probes/agent_reports/dlc_primary.md.