Just open an image file with it and use standard keyboard shortcuts to see other images available in the same folder.

Try page up and down keys, left and right arrows and space bar. Mouse wheel works for navigation, too.

Auto-rotate option based on EXIF is enabled by default. If you open a selection of several images the program will browse only through that selection.

Photo Gadget Viewer can sort image files by name, date or size. To get full screen view simply double click on displayed image.

Supported image file formats are BMP, TIFF, PNG, PCX, TGA and JPG. In the settings dialog you can select image file extensions that you want to be associated with the program so that it opens those files directly on double click.