Lumia 820 isn't detected in Windows 8 - visual-studio-2012

Question

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

Answer 1

if still this problem persists .. try installing windows media feature pack.. it will work like charm..!!
You'll need the most recent Media Pack - search it directly at Microsoft:
https://www.microsoft.com/en-us/search/result.aspx?q=media+feature+pack+for+windows10&form=dlc

Answer 2

Sounds like a driver issue.
Try to reinstall your driver using the following steps:
a.Connect your Windows Phone to your computer by using the USB cable
that was included with your phone.
b.Windows 8 users: In the Start
screen, type "Device Manager," tap or click Settings, and then tap or
click Device Manager. Windows 7, Vista, and XP users: Click Start,
right-click Computer, and then click Properties.
c.A window will
appear with the name of your computer and a list of files. (If you
don't see the files, click the name of your computer.) The name of
your Windows Phone 8 should be listed under Portable Devices. If
Windows Phone was incorrectly installed, it may be listed with a
yellow exclamation mark. Or, it may be listed under Other Devices as a
USB device or an unknown device.
d.Double-tap or double-click Windows
Phone (under Portable Devices) or the unknown device to open the
Properties window.
e.On the Driver tab, tap or click Uninstall.
f.In
the pop-up box "Confirm Device Uninstall," select "Delete the driver
software for this device" and then tap or click OK.
g.Return to the
Device Manager window. Tap or click the Action menu, and then tap or
click Scan for hardware changes.
h.Open Portable Devices, double-tap
or double-click the name of your Windows Phone, and then click the
Driver tab. Note If you don't see your phone's name, tap or click the
unknown device that is listed under Other Devices, and then tap or
click the Driver tab.
i.Tap or click Update Driver.
j.Tap or click
Browse my computer for driver software.
k.Tap or click Browse, locate
the C:\Windows\Inf\ folder on your computer, and then click OK.
l.Click Next and if you're prompted, click Install. You may only be
given a Close option.
m.After the driver installation is complete,
close the open windows until you exit the Device Manager. Restart your
computer if you're prompted.
From http://support.microsoft.com/kb/2749484

Answer 3

Maybe It is a driver issue. Try installing driver by using these steps
open device manager
under portable devices look for your device
Right click on your device and click update driver software
Browse my computer for driver software -> let me pick from a list -> Standard MTP Device
After that install MTP Device
This worked for me.