diff --git a/os/windows/installer/install.nsi b/os/windows/installer/install.nsi
index ddac0e7e84..a88b1f35a1 100644
--- a/os/windows/installer/install.nsi
+++ b/os/windows/installer/install.nsi
@@ -545,15 +545,22 @@ FunctionEnd
 ;-------------------------------------------------------------------------------
 ; Determine windows version, returns "win9x" if Win9x/Me/2000/XP SP2- or "winnt" for the rest on the stack
 Function GetWindowsVersion
+	GetVersion::WindowsPlatformArchitecture
+	Pop $R0
+	IntCmp $R0 64 WinNT 0
 	ClearErrors
 	StrCpy $R0 "win9x"
 	${If} ${IsNT}
 		${If} ${IsWinXP}
 		${AndIf} ${AtLeastServicePack} 3
 		${OrIf} ${AtLeastWin2003}
-			StrCpy $R0 "winnt"
+			GoTo WinNT
 		${EndIf}
 	${EndIf}
+	GoTo Done
+WinNT:
+	StrCpy $R0 "winnt"
+Done:
 	Push $R0
 FunctionEnd
 
diff --git a/src/gfx_layout.cpp b/src/gfx_layout.cpp
index cf2fe6da28..6f91fe832e 100644
--- a/src/gfx_layout.cpp
+++ b/src/gfx_layout.cpp
@@ -163,6 +163,12 @@ public:
 		int GetWidth() const   { return l->getWidth(); }
 		int CountRuns() const  { return l->countRuns(); }
 		const ParagraphLayouter::VisualRun *GetVisualRun(int run) const { return *this->Get(run); }
+
+		int GetInternalCharLength(WChar c) const
+		{
+			/* ICU uses UTF-16 internally which means we need to account for surrogate pairs. */
+			return Utf8CharLen(c) < 4 ? 1 : 2;
+		}
 	};
 
 	ICUParagraphLayout(ParagraphLayout *p) : p(p) { }
@@ -259,6 +265,8 @@ public:
 		int GetWidth() const;
 		int CountRuns() const;
 		const ParagraphLayouter::VisualRun *GetVisualRun(int run) const;
+
+		int GetInternalCharLength(WChar c) const { return 1; }
 	};
 
 	const WChar *buffer_begin; ///< Begin of the buffer.
@@ -699,12 +707,7 @@ Point Layouter::GetCharPosition(const char *ch) const
 		size_t len = Utf8Decode(&c, str);
 		if (c == '\0' || c == '\n') break;
 		str += len;
-#ifdef WITH_ICU
-		/* ICU uses UTF-16 internally which means we need to account for surrogate pairs. */
-		index += len < 4 ? 1 : 2;
-#else
-		index++;
-#endif
+		index += (*this->Begin())->GetInternalCharLength(c);
 	}
 
 	if (str == ch) {
@@ -762,15 +765,8 @@ const char *Layouter::GetCharAtPosition(int x) const
 				for (const char *str = this->string; *str != '\0'; ) {
 					if (cur_idx == index) return str;
 
-					WChar c;
-					size_t len = Utf8Decode(&c, str);
-#ifdef WITH_ICU
-					/* ICU uses UTF-16 internally which means we need to account for surrogate pairs. */
-					cur_idx += len < 4 ? 1 : 2;
-#else
-					cur_idx++;
-#endif
-					str += len;
+					WChar c = Utf8Consume(&str);
+					cur_idx += line->GetInternalCharLength(c);
 				}
 			}
 		}
diff --git a/src/gfx_layout.h b/src/gfx_layout.h
index 4d85cb5a22..7cd70ce280 100644
--- a/src/gfx_layout.h
+++ b/src/gfx_layout.h
@@ -124,6 +124,7 @@ public:
 		virtual int GetWidth() const = 0;
 		virtual int CountRuns() const = 0;
 		virtual const VisualRun *GetVisualRun(int run) const = 0;
+		virtual int GetInternalCharLength(WChar c) const = 0;
 	};
 
 	virtual void Reflow() = 0;
diff --git a/src/script/api/ai_changelog.hpp b/src/script/api/ai_changelog.hpp
index 4338c29a3e..9ee9dce247 100644
--- a/src/script/api/ai_changelog.hpp
+++ b/src/script/api/ai_changelog.hpp
@@ -15,6 +15,10 @@
  * functions may still be available if you return an older API version
  * in GetAPIVersion() in info.nut.
  *
+ * \b 1.3.3
+ *
+ * No changes
+ *
  * \b 1.3.2
  *
  * No changes
diff --git a/src/script/api/game_changelog.hpp b/src/script/api/game_changelog.hpp
index 97b581b751..7dd0cf486c 100644
--- a/src/script/api/game_changelog.hpp
+++ b/src/script/api/game_changelog.hpp
@@ -15,6 +15,10 @@
  * functions may still be available if you return an older API version
  * in GetAPIVersion() in info.nut.
  *
+ * \b 1.3.3
+ *
+ * No changes
+ *
  * \b 1.3.2
  *
  * No changes