If your icon art is showing the wrong application, follow the steps below.
1. Close and save anything that you are working on. This command will kill explorer and restart the computer when completed.
2. Open a command prompt in Windows 7 or Windows 8.
3. In the command prompt, Copy and paste each command line below exactly as is one at a time and press enter after each command.
taskkill /IM explorer.exe /F
DEL "%localappdata%\IconCache.db" /A
shutdown /r /f /t 00
4. The IconCache.db file has now been rebuilt.