Convert bkg to bmp Online: bkg2bmp

You can use Tom's Editor to easily convert images from
Movie Maker Background .BKG to Microsoft Windows bitmap .BMP.
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.

BMP

Format created by Microsoft for their Windows and OS/2 operating systems. Images can be compressed or not.