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I´m using Windows 7 x64. I can see the .jpg, .gif, etc. preview thumbnails but if .PNG, I only see the generic image, and not the image preview like in the other formats.

What can I do to fix this?

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3 Answers 3

I had this same problem and was able to fix it with two steps, although, I'm uncertain I actually needed to do the first step:

1) In Windows Explorer, I right clicked on a .PNG file, went to Open With, selected Choose Default Program... and chose Windows Photo Viewer as the default program to open .PNG files. This changed all my .PNG thumbnails to an icon of flowers. (I don't think this was required, but including what I did for completeness.)

(If the menu is not visible press [Alt])

2) In Windows Explorer, I clicked Tools, Folder options, went to the View tab, expanded Files and Folders and removed the check mark from Always show icons, never thumbnails. (I think this is all I had to do to make it work, but have not verified that.)

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#2 sorted it for me! What a weird default... –  Jamie Brown Jul 21 at 12:43

This is caused by having a program installed, such as Adobe Photoshop, that takes away the "default program" from Windows Photo Viewer.

You can restore this by following the two following articles, which outline it much better than I could here:

http://www.vistax64.com/tutorials/73715-thumbnails-windows-explorer.html

and

http://www.vistax64.com/tutorials/83196-default-programs-program-default-associations.html

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It could potentially be an issue with the icon cache on the computer.

Perhaps take a look at this issue here I don't know if its the same issue but it seems to be a few easy steps that could potentially resolve your problem

Rebuilding the Icon Cache Database

  1. Close all folder windows that are currently open.
  2. Launch Task Manager using the CTRL+SHIFT+ESC key sequence, or by running taskmgr.exe.
  3. In the Process tab, right-click on the Explorer.exe process and select End Process.
  4. Click the End process button when asked for confirmation.
  5. From the File menu of Task Manager, select New Task (Run…)
  6. Type CMD.EXE, and click OK
  7. In the Command Prompt window, type the commands one by one and press ENTER after each command: CD /d %userprofile%\AppData\Local DEL IconCache.db /a EXIT
  8. In Task Manager, click File, select New Task (Run…)
  9. Type EXPLORER.EXE, and click OK.
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