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Watch Dogs: Legion — Modding Workflow

Step-by-step workflow for modding Watch Dogs: Legion.

Prerequisites​

  • UnpackLegion — the correct tool for WDL archive extraction
  • DisruptManager (rootCBR) — for packing and installing mods

Workflow​

1. Unpack the game data​

Use UnpackLegion to extract patch.dat/patch.fat:

UnpackLegion.exe patch.dat

⚠ Do NOT use Gibbed's Unpack tool or PackLegion — they are outdated and break on WDL archives.

2. Edit files​

Modify extracted files as needed — binary objects, textures, materials, etc.

For binary object editing, Gibbed.Disrupt.ConvertBinaryObject.exe (the WD2 version) handles WDL binary objects.

3. Pack and install mods​

Use DisruptManager (rootCBR) to pack modified files into patch* archives and install them.

⚠ DisruptManager skips the installpackage trick. It only packs into patch* archives. See below for the installpackage workaround.

Archive Priority​

WDL loads archives in this order (highest priority first):

  1. patch (and patch0, patch1, etc.)
  2. common
  3. worlds\london\london

installpackage Workaround​

The installpackage archive is unused by default. A hex edit to the game DLL (DuniaDemo_clang_64_dx11.dll / DuniaDemo_clang_64_dx12.dll) reorders priority so installpackage/ loads before patch:

search: 48 b8 17 00 00 00 39 00 00 00 replace 39 → 2b
search: c7 86 00 0d 00 00 88 13 00 00 replace 88 13 → 00 00

Once patched, it's permanent — install mods into installpackage/ and never repack the ~16GB patch archive again.

Cross-reference: Full hex edit details → installpackage Patch

⚠ Editing the DLL trips BattlEye's modified-file check. Bypass with -BattlEyeLauncher launch arg (BattlEye removed in latest WDL version).

Cross-References​