diff --git a/BizHawk.Client.Common/RomLoader.cs b/BizHawk.Client.Common/RomLoader.cs
index f9e57a4f62..f5b8a903a6 100644
--- a/BizHawk.Client.Common/RomLoader.cs
+++ b/BizHawk.Client.Common/RomLoader.cs
@@ -409,7 +409,7 @@ namespace BizHawk.Client.Common
 						if (core != null)
 						{
 							// use coreinventory
-							nextEmulator = core.Create(nextComm, game, rom.RomData, Deterministic, GetCoreSettings(core.Type), GetCoreSyncSettings(core.Type));
+							nextEmulator = core.Create(nextComm, game, rom.RomData, rom.FileData, Deterministic, GetCoreSettings(core.Type), GetCoreSyncSettings(core.Type));
 						}
 					}
 
diff --git a/BizHawk.Emulation.Cores/Consoles/Nintendo/N64/N64.cs b/BizHawk.Emulation.Cores/Consoles/Nintendo/N64/N64.cs
index cc2ee0f2a8..48948697a6 100644
--- a/BizHawk.Emulation.Cores/Consoles/Nintendo/N64/N64.cs
+++ b/BizHawk.Emulation.Cores/Consoles/Nintendo/N64/N64.cs
@@ -45,7 +45,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.N64
 		/// <param name="rom">Rom that should be loaded</param>
 		/// <param name="syncSettings">N64SyncSettings object</param>
 		[CoreConstructor("N64")]
-		public N64(CoreComm comm, GameInfo game, byte[] rom, object settings, object syncSettings)
+		public N64(CoreComm comm, GameInfo game, byte[] file, object settings, object syncSettings)
 		{
 			int SaveType = 0;
 			if (game.OptionValue("SaveType") == "EEPROM_16K")
@@ -64,7 +64,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.N64
 				_syncSettings.DisableExpansionSlot = false;
 			}
 
-			byte country_code = rom[0x3E];
+			byte country_code = file[0x3E];
 			switch (country_code)
 			{
 				// PAL codes
@@ -109,7 +109,7 @@ namespace BizHawk.Emulation.Cores.Nintendo.N64
 			//not sure why this works... if we put the plugin initializations in here, we get deadlocks in some SDL initialization. doesnt make sense to me...
 			RunThreadAction(() =>
 			{
-				api = new mupen64plusApi(this, rom, videosettings, SaveType, (int)coreType, _syncSettings.DisableExpansionSlot);
+				api = new mupen64plusApi(this, file, videosettings, SaveType, (int)coreType, _syncSettings.DisableExpansionSlot);
 			});
 
 			// Order is important because the register with the mupen core
diff --git a/BizHawk.Emulation.Cores/CoreInventory.cs b/BizHawk.Emulation.Cores/CoreInventory.cs
index c7fc7d3e46..316c484412 100644
--- a/BizHawk.Emulation.Cores/CoreInventory.cs
+++ b/BizHawk.Emulation.Cores/CoreInventory.cs
@@ -73,6 +73,7 @@ namespace BizHawk.Emulation.Cores
 				CoreComm comm,
 				GameInfo game,
 				byte[] rom,
+				byte[] file,
 				bool deterministic,
 				object settings,
 				object syncsettings
@@ -82,6 +83,7 @@ namespace BizHawk.Emulation.Cores
 				bp(o, "comm", comm);
 				bp(o, "game", game);
 				bp(o, "rom", rom);
+				bp(o, "file", file);
 				bp(o, "deterministic", deterministic);
 				bp(o, "settings", settings);
 				bp(o, "syncsettings", syncsettings);