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?
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:
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:
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