Copying HMI projects integrated in SIMATIC STEP 7 at file level

QUESTION:   Can I copy a SIMATIC WinCC flexible project integrated in SIMATIC STEP 7 at file level?  ANSWER:   Copying of HMI projects integrated in STEP 7 at file level (e.g. with Windows Explorer via Copy/Cut and Paste) is not possible in combination with WinCC flexible.  By copying of HMI projects integrated in STEP 7 (*.hmi) at file level you lose internal references from the WinCC flexible