Convert bkg to flif Online: bkg2flif

You can use Tom's Editor to easily convert images from
Movie Maker Background .BKG to Free Lossless Image Format .FLIF.
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.

FLIF

Free Lossless Image Format is an image format with extension FLIF.