diff --git a/CMakeLists.txt b/CMakeLists.txt
index cad5618a..a0645b3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -455,7 +455,11 @@ if (MINGW)
 endif()
 
 if (MSVC)
-  target_sources(lego1 PRIVATE LEGO1/LegoOmni.def)
+  if(CMAKE_SIZEOF_VOID_P EQUAL 4)
+    target_sources(lego1 PRIVATE LEGO1/LegoOmni.def)
+  else()
+    target_sources(lego1 PRIVATE LEGO1/LegoOmni64.def)
+  endif()
 else()
   target_sources(lego1 PRIVATE LEGO1/LegoOmni.mingw.def)
 endif()
diff --git a/LEGO1/LegoOmni64.def b/LEGO1/LegoOmni64.def
new file mode 100644
index 00000000..e0717e35
--- /dev/null
+++ b/LEGO1/LegoOmni64.def
@@ -0,0 +1,64 @@
+; LegoOmni64.def : Declares the module paarameters for the LEGO1.DLL.
+
+; DESCRIPTION  "Lego OMNI Windows Dynamic Link Library"
+
+EXPORTS
+
+; EXPORTs really required only.
+
+?SetCD@MxOmni@@SAXPEBD@Z
+?VariableTable@@YAPEAVMxVariableTable@@XZ
+?SetVariable@MxVariableTable@@QEAAXPEBD0@Z
+?CreateInstance@LegoOmni@@SAXXZ
+?TickleManager@@YAPEAVMxTickleManager@@XZ
+??1MxVideoParam@@QEAA@XZ
+?configureLegoModelPresenter@LegoModelPresenter@@SAXH@Z
+?SetHD@MxOmni@@SAXPEBD@Z
+?QueueEvent@LegoInputManager@@QEAAXW4NotificationId@@EJJE@Z
+?TransitionManager@@YAPEAVMxTransitionManager@@XZ
+??1MxString@@UEAA@XZ
+??0MxOmniCreateParam@@QEAA@PEBDPEAUHWND__@@AEAVMxVideoParam@@VMxOmniCreateFlags@@@Z
+?configureLegoAnimationManager@LegoAnimationManager@@SAXH@Z
+?GetCD@MxOmni@@SAPEBDXZ
+?configureLegoWorldPresenter@LegoWorldPresenter@@SAXH@Z
+?GameState@@YAPEAVLegoGameState@@XZ
+?Streamer@@YAPEAVMxStreamer@@XZ
+??1MxOmniCreateParam@@UEAA@XZ
+?configureLegoROI@LegoROI@@SAXH@Z
+?Lego@@YAPEAVLegoOmni@@XZ
+??0MxVideoParamFlags@@QEAA@XZ
+??0MxDSAction@@QEAA@XZ
+?VideoManager@@YAPEAVLegoVideoManager@@XZ
+?Timer@@YAPEAVMxTimer@@XZ
+?RemoveAll@ViewManager@@QEAAXPEAVViewROI@@@Z
+??4MxAtomId@@QEAAAEAV0@AEBV0@@Z
+?Enable@MxBackgroundAudioManager@@QEAAXE@Z
+?SetDeviceName@MxVideoParam@@QEAAXPEAD@Z
+??0MxVideoParam@@QEAA@XZ
+?SetSavePath@LegoGameState@@QEAAXPEAD@Z
+?MoveCursor@LegoVideoManager@@QEAAXHH@Z
+?SetWaitIndicator@MxTransitionManager@@QEAAXPEAVMxVideoPresenter@@@Z
+?Save@LegoGameState@@QEAAJK@Z
+??1MxDSAction@@UEAA@XZ
+?RemoveWorld@LegoOmni@@QEAAXAEBVMxAtomId@@J@Z
+?GetPrimaryBitDepth@MxDirectDraw@@SAHXZ
+?CreateBackgroundAudio@LegoOmni@@QEAAXXZ
+?SerializePlayersInfo@LegoGameState@@QEAAXF@Z
+?GetInstance@LegoOmni@@SAPEAV1@XZ
+?BackgroundAudioManager@@YAPEAVMxBackgroundAudioManager@@XZ
+?configureLegoPartPresenter@LegoPartPresenter@@SAXHH@Z
+?EnableRMDevice@LegoVideoManager@@QEAAHXZ
+?GetRealTime@MxTimer@@QEAAJXZ
+?SetAtomId@MxDSObject@@UEAAXVMxAtomId@@@Z
+?DestroyInstance@MxOmni@@SAXXZ
+?InputManager@@YAPEAVLegoInputManager@@XZ
+?Open@MxStreamer@@QEAAPEAVMxStreamController@@PEBDG@Z
+?Start@@YAJPEAVMxDSAction@@@Z
+??4MxVideoParam@@QEAAAEAV0@AEBV0@@Z
+?EnableFullScreenMovie@LegoVideoManager@@QEAAXEE@Z
+?configureLegoBuildingManager@LegoBuildingManager@@SAXH@Z
+?SerializeScoreHistory@LegoGameState@@QEAAXF@Z
+?Close@MxStreamer@@QEAAJPEBD@Z
+??0MxOmniCreateFlags@@QEAA@XZ
+??1MxAtomId@@QEAA@XZ
+?SetSound3D@MxOmni@@SAXE@Z