If you can't delete a folder because the Thumbs.db file is 'in use by Explorer,' this video will show how to delete that single file and the folder without having to disable the thumbnail functionality or make systemwide changes.
Download PowerShell using one of these methods (Windows Store is probably best for most of us): https://learn.microsoft.com/en-us/pow...
0:00 Intro
0:31 Some background
1:47 The process