I already found what doesn't work in the DesktopX but I can't correct this problem.
The last version of Windows Media Player that I have used on Windows XP PRO SP2 was: 11.0.5721.5230.
But the number of version in the Vista Ultimate is: 11.0.6000.6344.
The ActiveX Control of this player doesn't supported in the DesktopX. So any of "Sub(s)" like:
Sub Control_MouseDown(nButton, nShiftState, fX, fY),
Sub Control_MediaChange(Item), etc...
doesn't work on Vista.
Please help me to solve this problem or show me the way how I must correct this by myself because I can't work with DesktopX anymore!