To quickly view images of all supported types in a folder:
Use SquishPic to open one of the images in the target folder.
You can drag an image to the SquishPic icon, or open SquishPic first then choose File > Open Image to open one of the target images.
Use the Image Navigator arrows and at the bottom of the window to view other images in the folder.
SquishPic will display compatible images in alphabetical order.
TIP: You can also select images in a folder, then drag them to the SquishPic icon to open them in separate windows.
For more information about supported file formats, see Supported file types.