By skyforbes 
How can I change position, dimension and shape of the thumbnails showing on folders? Just changing folder icons (even in imageres.dll) doesn't change thumbnails and make them very ugly with the custom icons.
Is it in a dll? A register key? Is a third-party software needed to do this?
If you find this post more appropriate for r/windowshelp or r/techsupport, tell me please.