Right click the URL you dragged to the desktop and then click the Change icon button. It should load the contents of the SHELL32.dll file automatically.
Steps to change all apps shortcut icon on desktop in Windows 8/8.1: Step 1: Right-click the shortcut and choose Properties to access its properties window.
Right-click anywhere on the desktop and choose Personalize from the pop-up menu. Click the option to change desktop icons. Select the icons you want to appear ...