CCB
CCB is an image format commonly used in 3DO games and is most likely unique to this console. The extension of the format usually varies from game to game, however the original is presumably .cel.
The format can be identified by the value 0x43434220 ("CCB ") of the first four bytes of the file.
Conversion Tools
3DOResExplorer
The tool recognises the format by its contents, so the extension does not matter. It is capable of converting CCB files to BMP.
List of games using the format
The list is not complete! Feel free to add other games that are known to use aforementioned format.
All of the following games are for 3DO
