Steps to add custom ICO files to PC
1. Open the Desktop by clicking Desktop tile on the Start Screen.
2. Next, Right click on your desktop and select Personalize.
3. Next, click on ‘Change desktop icons‘ located at the top-right corner.
4. Next, select / check the icons you want to show on your desktop. Then Click on the Apply and OK.
5. Now you will see the icons you have selected on your desktop. That are the complete steps to add new desktop icons in Windows 8.