When I use the USB cable for connection with the PC, he shows that there is a connection with a windowsphone, but he shows not any of the maps from my phone??
Does anyone know how I solve this problem.
You won't see the map data files on your phone. The windowsphone OS compartmentalises all the apps and their data files for security reasons. All you will see are user files such as photos, videos, documents, etc. Map data can be managed using the Here Maps or Drive app on the phone.
If you use the new app Lumia Storage Check, then you are able to place your HERE map data to a memory card. And then you are able to see it in Windows. However, I am not sure, why you do not see any files at all. Is your Lumia listed in the Windows Explorer? Do you have the Windows Phone App installed in Windows 7?