What is a CDI file?
The .CDI file extension has multiple uses. The most common use is a DiscJuggler Disc Image created by Padus DiscJuggler. These files store an exact digital copy of a CD or DVD. Users often use them to back up Sega Dreamcast games. A .CDI file can also be an automotive update file used by Harman/Becker and Daimler AG for vehicle systems. Additionally, the file might contain race data from Cyanide Pro Cycling Manager, or it could be an INTEX Output File generated by INTEX.
How to open CDI files?
You can open DiscJuggler disc images with virtual drive software like Daemon Tools or burn them to a physical disc using ImgBurn. Emulators like Flycast or Redream can load the Dreamcast game images directly. The automotive update files, INTEX Output Files, and game save files require their original software to function correctly.
Identify and inspect unknown files
viewer.online/cdi can analyze .CDI files to identify the exact format and creator software, inspect the file structure, extract readable text, and check whether an online preview is available.
Summary
Because the .CDI extension has multiple meanings, you might not know what format your file uses. viewer.online/cdi is useful for identifying, inspecting, and understanding .CDI files without installing software or dealing with compatibility problems.