Thumbnail previews for .mp4's not showing but all other formats are

Hi to everyone on here.

I know it's not a big problem, but for me this is for some strange reason, important. I recently tried 'Registry Mechanic" by PC Tools and it seems to be ok, but I will possibly stick to just CCleaner from now on.

My issue is that all video (wmv & avi) and image files are displaying in their folders correctly with nice thumbnails but now mp4's don't have thumbs anymore, just an icon. they were showing fine until recently.

I would really like to get them back if possible, so if anyone can help me I would be very grateful indeed. I am quite sure the folder options are all ok because all the other usual formats are displaying the thumbs correctly.

(Win 7 Home Premium 32-bit, fully updated, no system errors at all so far)

Hi Maguscreed, thanks for your reply. Just before I try your suggestions, perhaps I should explain that the file association, as far as I can see, is perfectly ok. In that, any mp4 file opens and plays perfectly fine with WMP, so the 'association' is there already (please correct me if I'm wrong).

Secondly, your second link points to a solution for someonw who had probs with "shortcuts to" .mp4's, in my case I dont have the thumbs showing for the actual files themselves.

So, bearing this in mind, should I still try your 1st registry re-association step??

I tried your above suggestions and it is stil the same, as I said in my second post above the files (.mp4's) are opening and playing with wmp ok, i'm just not getting thumbs showing.

I have attached a screenshot.

thanks very much for your quick reply. The thing is, mp4 support must have been there before because I had the thumbs showing until my use of registry Mechanic, and they do open & play perfectly. i didnt install any additional codecs previously, only VLC which I believe has its own all self contained.

Maguscreed,

Just got a big surprise, I re-installed Windows Live Movie Maker + Live Photo Gallery and ALL thumbs are back!!

I guess I was wrong to assume it was anything to do with Registry Mechanic, I didnt think that it might be something to do with uninstalling both of the above (I did that because i got hold of a copy of Movie Maker 6 and found it to be a better version so ripped out the live version previously)

Hopefully if anyone else does as I did and loses their mp4 thumb previews, they can try this.

Thanks for your efforts anyway Maguscreed.

Good point. Yes, I'm going to just stick to CCleaner from now on as it doesn't go anywhere near as 'deep' into the registry as the other more heavy duty paid reg' cleaners seem to. Never had a prob before just using CCleaner.

I am wondering if my situation was caused by uninstalling the above apps alone or was it down to using Registry Mechanic after??, or maybe the combo of both?, I guess I wont know but I do know that I will stay with what i've got now as all is working well.

Regards