diff --git a/Facepunch.Steamworks/Generated/Interfaces/ISteamInventory.cs b/Facepunch.Steamworks/Generated/Interfaces/ISteamInventory.cs
index 66fc25a..22b85d0 100644
--- a/Facepunch.Steamworks/Generated/Interfaces/ISteamInventory.cs
+++ b/Facepunch.Steamworks/Generated/Interfaces/ISteamInventory.cs
@@ -15,6 +15,7 @@ namespace Steamworks
 		{
 			_GetResultStatus = Marshal.GetDelegateForFunctionPointer<FGetResultStatus>( Marshal.ReadIntPtr( VTable, 0) );
 			_GetResultItems = Marshal.GetDelegateForFunctionPointer<FGetResultItems>( Marshal.ReadIntPtr( VTable, 8) );
+			_GetResultItems_Windows = Marshal.GetDelegateForFunctionPointer<FGetResultItems_Windows>( Marshal.ReadIntPtr( VTable, 8) );
 			_GetResultItemProperty = Marshal.GetDelegateForFunctionPointer<FGetResultItemProperty>( Marshal.ReadIntPtr( VTable, 16) );
 			_GetResultTimestamp = Marshal.GetDelegateForFunctionPointer<FGetResultTimestamp>( Marshal.ReadIntPtr( VTable, 24) );
 			_CheckResultSteamID = Marshal.GetDelegateForFunctionPointer<FCheckResultSteamID>( Marshal.ReadIntPtr( VTable, 32) );
@@ -57,6 +58,7 @@ namespace Steamworks
 			
 			_GetResultStatus = null;
 			_GetResultItems = null;
+			_GetResultItems_Windows = null;
 			_GetResultItemProperty = null;
 			_GetResultTimestamp = null;
 			_CheckResultSteamID = null;
@@ -110,10 +112,35 @@ namespace Steamworks
 		[return: MarshalAs( UnmanagedType.I1 )]
 		private delegate bool FGetResultItems( IntPtr self, SteamInventoryResult_t resultHandle, [In,Out] SteamItemDetails_t[]  pOutItemsArray, ref uint punOutItemsArraySize );
 		private FGetResultItems _GetResultItems;
+		[UnmanagedFunctionPointer( CallingConvention.ThisCall )]
+		[return: MarshalAs( UnmanagedType.I1 )]
+		private delegate bool FGetResultItems_Windows( IntPtr self, SteamInventoryResult_t resultHandle, [In,Out] SteamItemDetails_t.Pack8[]  pOutItemsArray, ref uint punOutItemsArraySize );
+		private FGetResultItems_Windows _GetResultItems_Windows;
 		
 		#endregion
 		internal bool GetResultItems( SteamInventoryResult_t resultHandle, [In,Out] SteamItemDetails_t[]  pOutItemsArray, ref uint punOutItemsArraySize )
 		{
+			if ( Config.Os == OsType.Windows )
+			{
+				SteamItemDetails_t.Pack8[] pOutItemsArray_windows = pOutItemsArray == null ? null : new SteamItemDetails_t.Pack8[ pOutItemsArray.Length ];
+				if ( pOutItemsArray_windows != null )
+				{
+					for ( int i=0; i<pOutItemsArray.Length; i++ )
+					{
+						pOutItemsArray_windows[i] = pOutItemsArray[i];
+					}
+				}
+				var retVal = _GetResultItems_Windows( Self, resultHandle, pOutItemsArray_windows, ref punOutItemsArraySize );
+				if ( pOutItemsArray_windows != null )
+				{
+					for ( int i=0; i<pOutItemsArray.Length; i++ )
+					{
+						pOutItemsArray[i] = pOutItemsArray_windows[i];
+					}
+				}
+				return retVal;
+			}
+			
 			return _GetResultItems( Self, resultHandle, pOutItemsArray, ref punOutItemsArraySize );
 		}
 		
diff --git a/Facepunch.Steamworks/Generated/SteamStructs.cs b/Facepunch.Steamworks/Generated/SteamStructs.cs
index 9200ab9..8c5ed9f 100644
--- a/Facepunch.Steamworks/Generated/SteamStructs.cs
+++ b/Facepunch.Steamworks/Generated/SteamStructs.cs
@@ -10707,7 +10707,21 @@ namespace Steamworks.Data
 		internal ushort Flags; // m_unFlags uint16
 		
 		#region Marshalling
-		internal static SteamItemDetails_t Fill( IntPtr p ) => ((SteamItemDetails_t)(SteamItemDetails_t) Marshal.PtrToStructure( p, typeof(SteamItemDetails_t) ) );
+		internal static SteamItemDetails_t Fill( IntPtr p ) => Config.PackSmall ? ((SteamItemDetails_t)(SteamItemDetails_t) Marshal.PtrToStructure( p, typeof(SteamItemDetails_t) )) : ((SteamItemDetails_t)(Pack8) Marshal.PtrToStructure( p, typeof(Pack8) ));
+		#endregion
+		#region Packed Versions
+		
+		[StructLayout( LayoutKind.Sequential, Pack = 8 )]
+		public struct Pack8
+		{
+			internal InventoryItemId ItemId; // m_itemId SteamItemInstanceID_t
+			internal InventoryDefId Definition; // m_iDefinition SteamItemDef_t
+			internal ushort Quantity; // m_unQuantity uint16
+			internal ushort Flags; // m_unFlags uint16
+			
+			public static implicit operator SteamItemDetails_t ( SteamItemDetails_t.Pack8 d ) => new SteamItemDetails_t{ ItemId = d.ItemId,Definition = d.Definition,Quantity = d.Quantity,Flags = d.Flags, };
+			public static implicit operator SteamItemDetails_t.Pack8 ( SteamItemDetails_t d ) => new SteamItemDetails_t.Pack8{ ItemId = d.ItemId,Definition = d.Definition,Quantity = d.Quantity,Flags = d.Flags, };
+		}
 		#endregion
 	}
 	
diff --git a/Generator/CodeWriter/ClassVTable.cs b/Generator/CodeWriter/ClassVTable.cs
index de6959c..5a8bee8 100644
--- a/Generator/CodeWriter/ClassVTable.cs
+++ b/Generator/CodeWriter/ClassVTable.cs
@@ -255,7 +255,16 @@ namespace Generator
 
 							if ( arg.IsVector )
 							{
-								WriteLine( $"{arg.TypeName}.Pack8[] {arg.VarName}_windows = {arg.VarName};" );
+								WriteLine( $"{arg.TypeName}.Pack8[] {arg.VarName}_windows = {arg.VarName} == null ? null : new {arg.TypeName}.Pack8[ {arg.VarName}.Length ];" );
+								StartBlock( $"if ( {arg.VarName}_windows != null )" );
+								{
+									StartBlock( $"for ( int i=0; i<{arg.VarName}.Length; i++ )" );
+									{
+										WriteLine( $"{arg.VarName}_windows[i] = {arg.VarName}[i];" );
+									}
+									EndBlock();
+								}
+								EndBlock();
 							}
 							else
 							{
@@ -274,7 +283,22 @@ namespace Generator
 						{
 							if ( !arg.WindowsSpecific ) continue;
 
-							WriteLine( $"{arg.VarName} = {arg.VarName}_windows;" );
+							if ( arg.IsVector )
+							{
+								StartBlock( $"if ( {arg.VarName}_windows != null )" );
+								{
+									StartBlock( $"for ( int i=0; i<{arg.VarName}.Length; i++ )" );
+									{
+										WriteLine( $"{arg.VarName}[i] = {arg.VarName}_windows[i];" );
+									}
+									EndBlock();
+								}
+								EndBlock();
+							}
+							else
+							{
+								WriteLine( $"{arg.VarName} = {arg.VarName}_windows;" );
+							}
 						}
 
 						if ( !returnType.IsVoid )
diff --git a/Generator/SteamApiDefinition.cs b/Generator/SteamApiDefinition.cs
index 97f65c9..7d1ffbb 100644
--- a/Generator/SteamApiDefinition.cs
+++ b/Generator/SteamApiDefinition.cs
@@ -60,7 +60,6 @@ namespace Generator
 			{
 				get
 				{
-					if ( Name.Contains( "SteamItemDetails_t" ) ) return true;
 					if ( Name.Contains( "MatchMakingKeyValuePair_t" ) ) return true;
 
 					if ( Fields.Any( x => x.Type.Contains( "CSteamID" ) ) )