diff --git a/scripts/win32/installer.nsi b/scripts/win32/installer.nsi
index 7a41ac7..cfcc26a 100644
--- a/scripts/win32/installer.nsi
+++ b/scripts/win32/installer.nsi
@@ -108,7 +108,8 @@ SectionEnd
 
 Section "Open STL files with Cura"
 	WriteRegStr HKCR .stl "" "Cura STL model file"
-	WriteRegStr HKCR "Cura STL model file\DefaultIcon" "" "$INSTDIR\stl.ico,0"
+	DeleteRegValue HKCR .stl "Content Type"
+	WriteRegStr HKCR "Cura STL model file\DefaultIcon" "" "$INSTDIR\Cura\stl.ico,0"
 	WriteRegStr HKCR "Cura STL model file\shell" "" "open"
 	WriteRegStr HKCR "Cura STL model file\shell\open\command" "" '"$INSTDIR\python\python.exe" "$INSTDIR\Cura\cura.py" "%1"'
 SectionEnd