CU3ML

Crappy Unreal Engine 3 Mod Loader — a dinput8.dll proxy that hijacks a UE3 game's load order, re-derives the engine's internal layout at runtime by disassembling the executable, and serves mod overrides without ever repacking a single .upk.

Why it exists

Most UE3 modding workflows repack .upk package files on disk — slow to iterate on, easy to corrupt, and tied to a specific game build's export table. CU3ML instead:

• Loads as a drop-in dinput8.dll proxy, no game files touched.
• Figures out the running game's internal structure by disassembling it the first time it starts, instead of shipping a hardcoded offset table per title — then caches what it found in cu3ml.addrlist so later launches skip the scan.
• Intercepts object loading in memory and substitutes mod content at Preload time — the original .upk on disk is never modified.
• Can append entirely new exports to a package's export map, so a mod can add objects a package never shipped with.
• Runs mod logic in an embedded Lua 5.4 VM with an ue3 binding table for loading objects, interning FNames, running engine console commands and rewriting localization.
• Ships an optional ImGui manager window that opens before the engine finishes booting, for toggling mods and loader settings.

Where to go next

At a glance