How to tame the Windows Thumbnailer
The Windows thumbnailer is a feature which allow to see previews* of files when you are in thumbnail mode in windows explorer.
Which Windows I need?
Tested with windows10, but I'm pretty sure will work even on 7 and on 8/8.1. Maybe even vista.
Even if the cache is hardly changed, I can't assure it works with XP or previous. Try on your risk.
What files are covered?
Actually, any media file should be covered, but windows only fetch some of them (due lack of codecs):
Audio files (mp3,wma,flac,ogg,..): I don't the see the point to preview audio files as you can't listen the preview at all.
Image files (png,gif,jpg,bmp,...): Windows cover most of them, but sometimes don't fetch thumbs for newer file types like for example the .webp.
Video files (avi,mp4,mkv,flv): Windows has several troubles here. Why? As several videos use codecs which aren't shipped with windows, so the preview is not possible.
Other files (txt,doc,swf,pdf): These types are a bit particular. So, the thumbnail may work or not as aren't fetched with the aid of a codec. Txt and doc previews never worked on explorer for what I know...