Video thumbnail previews gone after uninstalling K-Lite codecs

OK, so I'm pretty sure there's a gazillion threads on this issue but I've read A LOT of them and still, haven't found anything helpful (to me at least).

The problem started when I uninstalled K-Lite Codec Pack 8.80 (Full) after which all of my video thumbnail previews disappeared. I've checked the folder options and made sure that each is as it should be and still, nothing. What I have discovered though is that it's probably a registry issue. Also, re-installing the K-Lite Codec Pack fixes the issue, but i don't want it anymore and instead am going to be using CCCP (which does not fix the thumbnail problem, btw). If anyone can help me with this it would be much appreciated.

Thanks, will check that later. Although I guess what I'm also trying to ask is, does Windows 7 display these video thumbnail previews by default?

Ok, so before I tried Icaros I did a bit of digging in my program files and I found that K-Lite Codecs comes with Icaros so I guess that's why re-installing K-Lite solves the problem. Also I've tried rebuilding the cache and clearing/resetting it through disk cleanup, but still nothing. Again, while searching through the control panel I came across the "Associate a file type or protocol with a specific program" setting and I've found that there is no .avi extension on the list (along with .mkv). After seeing this I'm guessing that video file extensions which aren't listed won't have a thumbnail preview? - a noob conclusion.

I'm really fussy about the way things "should work" so I'm wondering if there's a "proper" registry fix for this?

OK, I'm hoping that restoring the file type associations will fix my problem and will let you know. Thanks for all the help!

Currently I play most of my videos through Media Player Classic but I have VLC and WMP as well (and currently no codec installed).

Ok so I tried those .reg files and it worked! My dear sir, you are brilliant. You and the guy who created/fixed those .reg files. THANK YOU!