How To Fix Windows 10 Icons Not Updating
By Chongchen Saelee

I found a link to instructions that actually works for Windows 10 icons not updating. Prior to Windows 10, the icons were stored in %userprofile%\AppData\Local\IconCache.db and all you had to do was delete that file and kill explorer.exe and start it again. At least, that seemed to work perfectly in Windows 7.

In Windows 10, you’re lucky if it updates the icons completely. You can follow the same steps, and it might work partially, but you’ll notice some icon sizes not updating. It’s associated to the filename and folder, so it’s cached somewhere else!

Well, indeed, Windows 10 stores multiple databases for all different icon sizes now, and in a whole different folder %homepath%\AppData\Local\Microsoft\Windows\Explorer. So you’re gonna have to delete all of those database cache files in order to properly update your Windows 10 icons!

This article gives you the details on how to do it properly:
https://www.windowscentral.com/how-reset-icon-cache-database-windows-10

Hope this helps anyone from pulling their hair out.