I've tried to turn off thumbnail cache by enabling "Turn off caching of thumbnail pictures" and "Turn off the caching of thumbnails in hidden thumbs.db files" in windows local group policy but thumbnail cache still spawns in C:\Users\<username>\AppData\Local\Microsoft\Windows\Explorer. The cache's size is also increasing as I roam around some folders with pictures. Am I doing it wrong or its broken? Please shed some light on this. Thanks.