diff --git a/artifacts/scripting/headers/command_lite.h b/artifacts/scripting/headers/command_lite.h
index 9c116754..713d5f46 100644
--- a/artifacts/scripting/headers/command_lite.h
+++ b/artifacts/scripting/headers/command_lite.h
@@ -1,5 +1,6 @@
 #ifndef COMMAND_H
 #define COMMAND_H
+#define COMMAND_LITE_H
 
 #define critter_is_armed(x)                 (((obj_item_subtype(critter_inven_obj(x,INVEN_TYPE_RIGHT_HAND))) == item_type_weapon) orElse \
                                              ((obj_item_subtype(critter_inven_obj(x,INVEN_TYPE_LEFT_HAND))) == item_type_weapon))
diff --git a/artifacts/scripting/headers/define_extra.h b/artifacts/scripting/headers/define_extra.h
index 7307a3be..7b8c9705 100644
--- a/artifacts/scripting/headers/define_extra.h
+++ b/artifacts/scripting/headers/define_extra.h
@@ -289,6 +289,7 @@
 #define CALIBER_7_62MM              (18)
 
 // hidden perks
+#ifndef DEFINE_LITE_H
 #define PERK_add_nuka               (53)
 #define PERK_add_buffout            (54)
 #define PERK_add_mentats            (55)
@@ -309,6 +310,7 @@
 #define PERK_add_jet                (70)
 #define PERK_add_tragic             (71)
 #define PERK_armor_charisma         (72)
+#endif
 
 #define WPN_ANIM_NONE               (0x00) // (A)
 #define WPN_ANIM_KNIFE              (0x01) // (D)
diff --git a/artifacts/scripting/headers/define_lite.h b/artifacts/scripting/headers/define_lite.h
index 5b991a9e..a0226d34 100644
--- a/artifacts/scripting/headers/define_lite.h
+++ b/artifacts/scripting/headers/define_lite.h
@@ -4,6 +4,7 @@
 
 #ifndef DEFINE_H
 #define DEFINE_H
+#define DEFINE_LITE_H
 
 //   This file holds all of the things that should be preprocessed.
 
diff --git a/sfall/FalloutStructs.h b/sfall/FalloutStructs.h
index f2c6be94..b4229d9e 100644
--- a/sfall/FalloutStructs.h
+++ b/sfall/FalloutStructs.h
@@ -766,6 +766,36 @@ struct ScriptListInfoItem {
 	long numLocalVars;
 };
 
+struct WinRegion { // sizeof = 0x88 (0x8C in the engine code)
+	char  name[32];
+	long  field_20;
+	long  field_24;
+	long  field_28;
+	long  field_2C;
+	long  field_30;
+	long  field_34;
+	long  field_38;
+	long  field_3C;
+	long  field_40;
+	TProgram* procScript;
+	long  proc_48;
+	long  proc_4C;
+	long  procEnter;
+	long  procLeave;
+	long  field_58;
+	long  field_5C;
+	long  field_60;
+	long  field_64;
+	long  flags_68;
+	long  field_6C;
+	long  field_70;
+	long  field_74;
+	void* func_78;
+	void* func_7C;
+	long  field_80;
+	long  field_84;
+};
+
 //for holding window info
 struct WINinfo {
 	long wID; // window position in the _window_index array
@@ -788,45 +818,45 @@ struct WINinfo {
 };
 
 struct sWindow {
-	char name[32];
-	long wID; // window position in the _window_index array
-	long width;
-	long height;
-	long region1;
-	long region2;
-	long region3;
-	long region4;
-	long *buttons;
-	long numButtons;
-	long setPositionX;
-	long setPositionY;
-	long clearColour;
-	long flags;
+	char  name[32];
+	long  wID; // window position in the _window_index array
+	long  width;
+	long  height;
+	WinRegion* regions;
+	long  region2;
+	long  countRegions;
+	long  region4;
+	long* buttons;
+	long  numButtons;
+	long  setPositionX;
+	long  setPositionY;
+	long  clearColour;
+	long  flags;
 	float randX;
 	float randY;
 };
 
 struct LSData {
-	char signature[24];
+	char  signature[24];
 	short majorVer;
 	short minorVer;
-	char charR;
-	char playerName[32];
-	char comment[30];
-	char unused1;
+	char  charR;
+	char  playerName[32];
+	char  comment[30];
+	char  unused1;
 	short realMonth;
 	short realDay;
 	short realYear;
 	short unused2;
-	long realTime;
+	long  realTime;
 	short gameMonth;
 	short gameDay;
 	short gameYear;
 	short unused3;
-	long gameTime;
+	long  gameTime;
 	short mapElev;
 	short mapNumber;
-	char mapName[16];
+	char  mapName[16];
 };
 
 struct Queue {
diff --git a/sfall/Interface.cpp b/sfall/Interface.cpp
index 01d06074..d465a41b 100644
--- a/sfall/Interface.cpp
+++ b/sfall/Interface.cpp
@@ -38,6 +38,12 @@ enum WinNameType {
 	WINTYPE_Skilldex  = 6,
 	WINTYPE_EscMenu   = 7, // escape menu
 	WINTYPE_Automap   = 8,
+
+	// Inventory types
+	WINTYPE_Inven     = 50, // player inventory
+	WINTYPE_Loot      = 51,
+	WINTYPE_Use       = 53,
+	WINTYPE_Barter    = 54
 };
 
 WINinfo* Interface_GetWindow(long winType) {
@@ -71,7 +77,7 @@ WINinfo* Interface_GetWindow(long winType) {
 		if (GetLoopFlags() & AUTOMAP) winID = Interface_ActiveInterfaceWID();
 		break;
 	default:
-		return (WINinfo*)(-1);
+		return (WINinfo*)(-1); // unsupported type
 	}
 	return (winID > 0) ? fo_GNW_find(winID) : nullptr;
 }