plugin: improve support on Windows

src/Tools/plugins/widget/CMakeLists.txt

@@ -59,7 +59,7 @@ target_compile_options(FreeCAD_widgets PRIVATE ${COMPILE_OPTIONS})
 # Get the install location of a plugin to determine the path to designer plguins
 get_target_property(QMAKE_EXECUTABLE Qt5::qmake LOCATION)
 exec_program(${QMAKE_EXECUTABLE} ARGS "-query QT_INSTALL_PLUGINS" RETURN_VALUE return_code OUTPUT_VARIABLE DEFAULT_QT_PLUGINS_DIR )
-set(DESIGNER_PLUGIN_LOCATION ${DEFAULT_QT_PLUGINS_DIR}/designer CACHE FILEPATH "Path where the plugin will be installed to")
+set(DESIGNER_PLUGIN_LOCATION ${DEFAULT_QT_PLUGINS_DIR}/designer CACHE PATH "Path where the plugin will be installed to")
 
 if (NOT IS_SUB_PROJECT)
     message(STATUS "Plugin will be installed to: ${DESIGNER_PLUGIN_LOCATION}")
@@ -69,5 +69,6 @@ endif()
 
 
 INSTALL(TARGETS FreeCAD_widgets
+    RUNTIME DESTINATION "$ENV{DESTDIR}${DESIGNER_PLUGIN_LOCATION}"
     LIBRARY DESTINATION "$ENV{DESTDIR}${DESIGNER_PLUGIN_LOCATION}"
 )