Lumia 820 isn't detected in Windows 8

[ZamanX90]

Hi,

I recently bought a Lumia 820. I connected it to windows 7 and worked perfectly, phone was accessible from the file explorer. but when I connect it to windows 8, Lumia 820 is showing in other section in the device manager, not showing in the file explorer. Strange thing is even without seeing the device in my machine I can test the application build through Visual studio by running it on windows phone 8 device. I installed windows phone app to the windows 8, it\s not running, not even giving me an error?

Help me please