How to repair broken thumbnail

Have u ever seen this problem in your windows?

As we see in this pic that the thumnnail not appear as always. You can resolve this with manual steps. With Right click on middle screen. and choose View > Thumbnail.

But in other case, that thing not work. If your windows has error on the registry / system.

To solve around this problem,  just add the ShellEx keys and the corresponding values for the image files to windows registry. Go to:
 

  1. Start > Run, then type regedit

  2. In Registry Editor, go to this following keys:  
      HKEY_LOCAL_MACHINE\SOFTWARE\Classes

  3. Click .gif

  4. On the Edit menu, point to New > Key

  5. In the New Key #1 box, type ShellEx, then press ENTER.

  6. On the Edit menu, point to New > Key again

  7. In the New Key #1 box, type this: 
       {BB2E617C-0920-11d1-9A0B-00C04FC2D6C1}
      Note The above key name contains zeros, and not the letter O

  8. Press ENTER.

  9. In the right pane, right-click Default > click Modify

10. In the Value data box, type the following:
       {7376D660-C583-11d0-A3A5-00C04FD706EC}
      Note The above value contains zeros, and not the letter O.11. 
      Click OK. Then restart your windows..^^

Note: you can do the same thing with other format, like .jpeg, .tif, .png and similars..