Files icons have been changed but the files are working properly

[Guest]

Hello,what i do to change the files in their original icons

 

[tigsounds]

Right-click an open area of the desktop, select 'Properties.'
Click 'Settings' and change the color depth of your system to any other setting, if you are at 32 bit, change to 16 bit. Click 'Apply' and then change back to what you had before. Click OK.

Now right-click an open area of the desktop and click 'Refresh.'