I'm not an expert at this but I think a screensaver file ends in .scr, and is an executable of some sorts, although it may have the ability of running animated gifs or avi and others. With irfanview, you can certainly package a bunch of images, animated Gifs and mp3 sound files into a screen saver. It's one thing to produce the media bits, it's another to present it as a screensaver application. I would not recommend animated Gif unless you don't care about the lack of colors. A frame in a Gif or Animated gif is 8-bit deep and this only 256 colors deep. In some cases that's alright. Hey, it's only a screensaver :-) but for some it's important to see the thousands or millions of colors of the images in the show.