diff --git a/src/WindowsInstaller/FreeCAD_WindowsInstaller.nsi b/src/WindowsInstaller/FreeCAD_WindowsInstaller.nsi
index 6de0e75ed2..991041d6b4 100644
--- a/src/WindowsInstaller/FreeCAD_WindowsInstaller.nsi
+++ b/src/WindowsInstaller/FreeCAD_WindowsInstaller.nsi
@@ -84,6 +84,8 @@ section "install"
 	file /r "..\..\doc\"
 	setOutPath $INSTDIR\data
 	file  /r /X CMakeFiles /X *.cmake /X *.dir /X *.vcproj /X CMakeLists.txt /X *.am "..\..\data\"
+	setOutPath $INSTDIR\Ext
+	file /r "..\..\Ext\"
 	setOutPath $INSTDIR
 	file  "vcredist_x86.exe"
 	
diff --git a/src/WindowsInstaller/FreeCAD_x64_WindowsInstaller.nsi b/src/WindowsInstaller/FreeCAD_x64_WindowsInstaller.nsi
index c33eb52fbd..a0f191c979 100644
--- a/src/WindowsInstaller/FreeCAD_x64_WindowsInstaller.nsi
+++ b/src/WindowsInstaller/FreeCAD_x64_WindowsInstaller.nsi
@@ -98,6 +98,8 @@ section "FreeCAD (Required)"
 	file /r "..\..\doc\"
 	setOutPath $INSTDIR\data
 	file  /r /X CMakeFiles /X *.cmake /X *.dir /X *.vcproj /X CMakeLists.txt /X *.am "..\..\data\"
+	setOutPath $INSTDIR\Ext
+	file /r "..\..\Ext\"
 	setOutPath $INSTDIR
 	file  "vcredist_x64.exe"