GIMP Plugin Registry

Are you sure that the Gif size is bigger then 0kb? some other software may open them? if you use windows you may try with to open them with irfanview or xnview, if they can't open good chances nothing else will One reason may be a error when saving, gimp allow to save with the wrong extension if you wish (ie you may save "imagine.gif" as xcf ) but then can't detect the extension if misnamed(i.e will fail to open "imagine.gif" if is a xcf and not a gif ) anyway irfanview should be able to detect the right extension and prompt you to rename