Convert duo to flif Online: duo2flif
You can use Tom's Editor to easily convert images from
DU1, DUO .DUO to Free Lossless Image Format .FLIF.
Tom's Editor is a free, online image manipulation and converter program.
Go to Tom's Editor
DU1, DUO is an image format with extension DUO.
Free Lossless Image Format is an image format with extension FLIF.