If you know you have an image format that's supported by UltraISO, then open the application and go to File > Open. Using this dialog, browse to the folder where the file is located. You can let the filter show all image files, but if you know the image file type you have, click the drop-down menu and select it from the list, then browse to its location. If the image is OK, UltraISO will open it and display its contents. Use the tree menu on the left to browse through directories.
