Valheim1CompatBridges
BepInEx preloader that adds old API signatures back to Valheim 1.0 so pre-1.0 mods (Weedheim, WeedheimShip, Marketplace And Server NPCs) load again. Includes a script for Marketplace two remaining IL fixes.Valheim1CompatBridges
BepInEx preloader patcher for Valheim 1.0 (Unity 6). It adds the old method overloads, fields and
interface defaults back into assembly_valheim.dll at load time, so mods compiled against pre-1.0 builds stop
crashing with MissingMethodException, MissingFieldException: ZRoutedRpc.Everybody, TypeLoadException: VTable setup failed or Harmony Undefined target method. No mod DLL is redistributed.
Tested with (client + dedicated server, BepInEx 5.4.2350):
| Mod | Result |
|---|---|
| MagicMike-Weedheim 2.0.4 | loads and works |
| MagicMike-WeedheimShip 1.0.2 | loads and works |
| KGvalheim-Marketplace_And_Server_NPCs_Revamped 9.8.1 | loads and works, with fix-kg-marketplace.ps1 applied once (see below); NPC map right-click (fashion) has no equivalent in 1.0 and does nothing; transmog icons in the inventory grid are not refreshed |
Install
Put the patchers/Valheim1CompatBridges folder into BepInEx/patchers/ on the client and on the
dedicated server (r2modman / Thunderstore Mod Manager do this automatically). Look for
[Valheim1CompatBridges] Gotowe: N mostkow in BepInEx/LogOutput.log.
What it bridges
Inventory.Changed()→Changed(false, false)(original renamed toChangedEx, game calls rerouted so Harmony postfixes onChangedstill fire)ZRoutedRpc.Everybodyconst → static fieldInventoryGrid.Elementwrapper type (m_go,m_pos, mirrored fields),GetElement/GetHoveredElementoverloads returning it, emptyList<Element> m_elements_compat(deliberately not namedm_elements: two same-named fields are legal in IL but makeAccessTools.Field(type, "m_elements")throwAmbiguousMatchException, breaking mods that inject___m_elementsby reflection, such as AzuExtendedPlayerInventory and AzuAutoStore)InventoryGrid.Awake()(called fromOnEnable),Minimap.OnMapRightClick()stubHoverable.GetHoverOffset()default implementation- old overloads of:
Character.Message,MessageHud.ShowMessage,EffectList.Create,SEMan.AddStatusEffect(×2),ItemData.GetTooltip,Inventory.IsTeleportable,Humanoid.IsTeleportable,Inventory.AddItem(12 params),Terminal.ConsoleCommandctor (12 params),Terminal.ConsoleEventArgsctor,YesNoPopupctor,Heightmap.Poke(bool),TerrainComp.Save(),Piece.SetCreator(long),VisEquipment.Set*Item(string, …)(prefab name → hash)
Using Marketplace as well?
Marketplace has two breakages the preloader cannot reach, because they live in the mod's own IL: its
Hud.UpdatePieceList transpiler hardcodes local slot 12 for a Piece that Valheim 1.0 moved to 13
(InvalidProgramException, quest markers missing from the build menu), and it reads the old
InventoryGrid.m_elements field from IL. The mod is closed-source, so there is no upstream fix to wait for.
Run this once per machine, against your own copy of the DLL:
pwsh -File tools/fix-kg-marketplace.ps1 -Dll "<game>/BepInEx/plugins/KGvalheim-Marketplace/kg.Marketplace.dll" -Apply
It reads the real slot numbers out of your assembly_valheim.dll instead of trusting a hardcoded one, is
idempotent, and refuses to guess if the layout it expects is gone. Keep the original DLL, and re-run it after
every Marketplace update. The script lives in the repo, not in this package.
Source, and why this is a new project rather than pull requests: https://github.com/PawelSzymanski89/Valheim1CompatBridges
