I´m using Windows 7 x64. I can see the
.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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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:
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)
In Windows Explorer, I clicked
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.)
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
- Close all folder windows that are currently open.
- Launch Task Manager using the CTRL+SHIFT+ESC key sequence, or by running taskmgr.exe.
- In the Process tab, right-click on the Explorer.exe process and select End Process.
- Click the End process button when asked for confirmation.
- From the File menu of Task Manager, select New Task (Run…)
- Type CMD.EXE, and click OK
- 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
- In Task Manager, click File, select New Task (Run…)
- Type EXPLORER.EXE, and click OK.
By following the next two steps, I was able to have the .PNG thumbnails restored. I am not sure whether both of them are necessary to fix the problem, though.
1. For me, the problem was caused by installing another piece of software (SageThumbs, in my case), which allowed me to display thumbnails for graphic file extensions that Windows 7 doesn't support natively. By turning off the function to generate thumbnails inside this third-party software, the cause of the problem was - presumably - gone.
2. Get rid of the current set of cached thumbnails (in '%userprofile%\AppData\Local\Microsoft\Windows\Explorer'). Trying to delete them manually didn't work, nor did selecting the option in CCleaner ('0 bytes removed' message). I was however able to delete the Windows 7 thumbnail cache by going to Start/Accessories/System Tools/Disk Cleanup, and selecting the option in the options list.
I had to turn 'Always show icons, never thumbnails' on (checked) and then back off (un-checked). Thanks to Chris H Sep 1 '16 at 8:36 for the idea.
Note - prior to this I did change the default association for PNG to be Photo Viewer. Not sure if this step was required.
This is caused by having a program installed, such as Adobe Photoshop, that takes away the "default program" from Windows Photo Viewer. The simplest way to restore thumbnail for png right here: - Just Right-Click on your png file -> Open with -> Choose another app -> Choose app Photos & stick to Always use this app to open .png files -> Restart your machine.
Had this problem too (Jan 2020) and nothing above worked but then it dawned on me that the PNG files I was trying to work with and weren't previewing were still on my phone...which was connected to a USB port on my computer. So when I cut and pasted them off the phone and into 'Pictures' on my PC, Windows Explorer previewed them straight away.