A setup installer version is available but there really is little need to use it as the program is a single executable, use the portable version instead. One of its few features is the ability to extract one, a selection, or all frames from an animated GIF file. It cannot and is not designed to open any other type of image file. This is a dedicated player and viewer only for GIF files. Saving to JPG will also let you select a quality level for the images. You have the option to save the current frame (Ctrl+S) or save all frames to JPG, BMP, PNG, TIF, still GIF, or WMF files (Ctrl+Shift+S). Click the Options button on the bottom right of the toolbar and go to Save Frames at the top. Load the animated GIF into 7GIF by dropping the file onto the window or manually using the Open button/menu. Of course, the most important function here is exporting frames from the animation. Both setup installer and portable versions are available.

Most of those function control playback of the file and include speed/frame control, scaling, playlists, slideshow, advanced properties, and Windows integration. 7GIF is a tool dedicated to playing animated GIF files with several little but possibly useful functions.

Ffmpeg gif from images