This is something asked on a certain application's mailing list and it got me curious.
Say there are several images (any format, JPEG, PNG etc) in a folder. The default image preview application is active and double-clicking on any image will open it in the previewer. Using the arrow keys or arrow buttons of the application will then move to the previous or next image in the folder.
Now move the entire folder to %TEMP% (which in my case is C:\Users\<user>\AppData\Local\Temp)Doing the same operation will open any image, but the previous & next operations are disabled. Selecting all the images, right-clicking and selecting preview will open one image with the previous & next functionality enabled. Why does this happen? It apparently only happens in the temporary folder (or a sub-folder).
Windows 7 Professional x64 Japanese edition, without any fancy customization.
