How to Set Shared Folder on Window 7 in Virtual Box

Go to "Devices" of Virtual Box settings and Run "Insert Guest Addition CD Image...".

It will download file on the internet. You will see "VirtualBox Guest Additions" on cd drive on Window 7.

Run VBoxWindowsAdditions-amd64 or VBoxWindowsAdditions-x86 that is right for your system.

Now you will see shared folder on File Explorer if you set shared folder on Virtual Box settings correctly.