OTC Loader

Release: MLVScan Attestation

OTC Loader is a lightweight MelonLoader plugin that automatically detects your game branch (IL2CPP or Mono) and disables any incompatible mod DLLs before they can crash MelonLoader. It works for all mods, not just OverTheCounter.

OTC Loader is a standalone plugin — install it alongside any mod that ships dual-branch DLLs.

For mod authors

If your mod ships both IL2CPP and Mono DLLs, you can point your users to install OTC Loader instead of writing your own branch detection. Add it as a Thunderstore dependency or recommend it in your install instructions.

How it works

• []Restore pass — Re-enables any DLLs it previously disabled (.dll.off and legacy .dll.di formats), so branch switches work automatically without manual cleanup.[/]

  []Scan pass — Checks every DLL in your Mods folder (including subdirectories). DLLs targeting the wrong branch are renamed to .dll.off. DLLs inside Plugins/ subfolders and infrastructure DLLs (S1API, SwapperPlugin) are always skipped.[/]

  []Compatibility check — If a disabled DLL has no compatible counterpart, a detailed log warning identifies the mod and suggests checking for a compatible release or switching game branches.[/]

  []Interactive review — On first-time disables, popup prompts let you review each incompatible mod, optionally whitelist individual DLLs, and manage your existing whitelist — all before a recommended restart.[/]

  []Restart prompt — A final popup explains which mods were disabled, confirms the game is safe to run, and recommends restarting so the runtime fully unloads cached assemblies.[/]

  Branch detection

  OTC Loader uses a two-stage detection strategy:

  • []Filename keywords — DLLs containing "mono" or "il2cpp" in their filename are classified instantly.[/]

    []Mono. Cecil fallback — If the filename is ambiguous, the DLL's type references are inspected via Mono. Cecil. IL2CPP-prefixed namespaces (Il2CppScheduleOne, Il2CppSystem) are matched first; bare ScheduleOne references are then used to identify Mono. DLLs with no recognizable references (native DLLs, locked files, branch-agnostic libraries) return unknown and are left alone.[/]

    When incompatible DLLs are detected for the first time, an interactive prompt walks you through each one — keep it disabled or whitelist it with a single click. If you already have a whiteli