Convert bkg to gif Online: bkg2gif

You can use Tom's Editor to easily convert images from
Movie Maker Background .BKG to CompuServe Graphics Interchange Format .GIF.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

BKG

Movie Maker Background is an image format with extension BKG.

GIF

GIF images were created by Compuserve. They can used no more than 256 colors and a single color transparenty (no Alpha channel). Today are rare since they offer low quality and huge filesizes. GIF animations are still in use.