DGU File

What are DGU files and how to open them

Are you having problems opening a DGU file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your DGU files.

What is a DGU file?

A .DGU file is a DuneGraph Uncompressed Bitmap file.

DuneGraph Uncompressed Bitmap is a raster image format created by the DuneGraph graphics program for the Atari Falcon computer. It stores full-color images without compression in a format well suited for graphical editing on the Falcon's video hardware. The format supports up to 8 bits per pixel (256 colors), and is intended for simple, fast access to pixel data where every pixel's value refers to a palette entry.

Images in this format are produced by DuneGraph. They are uncompressed, meaning pixels are stored sequentially in memory or in the file so that reading or editing individual pixels is straightforward. The image size and palette are included in the file so the program can render them correctly on the Falcon's screen or within emulators and viewers.

Files of this format begin with a signature at the start: four bytes equal to ASCII "DGU" followed by byte 0x01. This signature appears at offset zero.

How to open DGU files

Important: Different programs may use files with the DGU file extension for different purposes, so unless you are sure which format your DGU file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: October 27, 2026

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