1 Add the mod paks you want to merge
Drag & drop *_P.pak files here, or
Merge order: paks are applied in filename order (later ones win conflicts — shown in the report).
2 Point at your game's data pak
Pick pakchunk0-WindowsNoEditor.pak — usually at
…/Project Wingman/ProjectWingman/Content/Paks/
Only a few megabytes are read from it (the index + the datatables being merged) — even though the file is ~16 GB.
3 Merge
…
✅ Done —
Drop it into your ~mods folder and remove the original conflicting paks.