diff --git a/HD6309Exec.c b/HD6309Exec.c
index 31eaf522..3f155e85 100644
--- a/HD6309Exec.c
+++ b/HD6309Exec.c
@@ -2,7 +2,7 @@
 #include "library/HD6309.h"
 
 #include "library/HD6309Macros.h"
-#include "hd6309opcodes.h"
+#include "library/HD6309OpCodes.h"
 
 int HD6309Exec(int cycleFor)
 {
diff --git a/Vcc.vcxproj b/Vcc.vcxproj
index 9ebaded2..fc0ee05a 100644
--- a/Vcc.vcxproj
+++ b/Vcc.vcxproj
@@ -171,7 +171,6 @@
     <ClCompile Include="AudioConfig.c" />
     <ClCompile Include="BitBangerConfig.c" />
     <ClCompile Include="HD6309Exec.c" />
-    <ClCompile Include="hd6309opcodes.c" />
     <ClCompile Include="MC6809Exec.c" />
     <ClCompile Include="CpuConfig.c" />
     <ClCompile Include="CreateDDWindow.c" />
@@ -202,7 +201,6 @@
     <ClInclude Include="AudioConfig.h" />
     <ClInclude Include="BitBangerConfig.h" />
     <ClInclude Include="HD6309Exec.h" />
-    <ClInclude Include="hd6309opcodes.h" />
     <ClInclude Include="MC6809Exec.h" />
     <ClInclude Include="CpuConfig.h" />
     <ClInclude Include="CreateDDWindow.h" />
diff --git a/hd6309opcodes.h b/hd6309opcodes.h
deleted file mode 100644
index 7bd83f05..00000000
--- a/hd6309opcodes.h
+++ /dev/null
@@ -1,3 +0,0 @@
-#pragma once
-
-void HD6309ExecOpCode(int cycleFor, unsigned char opcode);
\ No newline at end of file
diff --git a/hd6309opcodes.c b/library/HD6309OpCodes.c
similarity index 99%
rename from hd6309opcodes.c
rename to library/HD6309OpCodes.c
index 83282d48..cd54beb8 100644
--- a/hd6309opcodes.c
+++ b/library/HD6309OpCodes.c
@@ -1,7 +1,7 @@
-#include "library/HD6309.h"
-#include "library/MMU.h"
+#include "HD6309.h"
+#include "MMU.h"
 
-#include "library/HD6309Macros.h"
+#include "HD6309Macros.h"
 
 static HD6309State* hd63096State = GetHD6309State();
 
@@ -7063,12 +7063,14 @@ void(*JmpVec3[256])(void) = {
 };
 
 //--Essentially Page_1()
-void HD6309ExecOpCode(int cycleFor, unsigned char opcode) {
-  HD6309State* hd63096State = GetHD6309State();
+extern "C" {
+  __declspec(dllexport) void __cdecl HD6309ExecOpCode(int cycleFor, unsigned char opcode) {
+    HD6309State* hd63096State = GetHD6309State();
 
-  hd63096State->gCycleFor = cycleFor;
+    hd63096State->gCycleFor = cycleFor;
 
-  JmpVec1[opcode](); // Execute instruction pointed to by PC_REG
+    JmpVec1[opcode](); // Execute instruction pointed to by PC_REG
+  }
 }
 
 void Page_2(void) //10
diff --git a/library/HD6309OpCodes.h b/library/HD6309OpCodes.h
new file mode 100644
index 00000000..b2dc2661
--- /dev/null
+++ b/library/HD6309OpCodes.h
@@ -0,0 +1,3 @@
+#pragma once
+
+extern "C" __declspec(dllexport) void __cdecl HD6309ExecOpCode(int cycleFor, unsigned char opcode);
diff --git a/library/library.vcxproj b/library/library.vcxproj
index d4580781..0445e20c 100644
--- a/library/library.vcxproj
+++ b/library/library.vcxproj
@@ -187,6 +187,7 @@
     <ClCompile Include="fileoperations.c" />
     <ClCompile Include="Graphics.c" />
     <ClCompile Include="HD6309.c" />
+    <ClCompile Include="HD6309OpCodes.c" />
     <ClCompile Include="IOBus.c" />
     <ClCompile Include="Joystick.c" />
     <ClCompile Include="Keyboard.c" />
@@ -218,6 +219,7 @@
     <ClInclude Include="Graphics.h" />
     <ClInclude Include="HD6309.h" />
     <ClInclude Include="HD6309Macros.h" />
+    <ClInclude Include="HD6309OpCodes.h" />
     <ClInclude Include="IOBus.h" />
     <ClInclude Include="Joystick.h" />
     <ClInclude Include="Keyboard.h" />