The B file extension is created by the game Grand Theft Auto III to save and store the game so it can be resumed from the same point.
GrandTheft Auto is an immensely popular sandbox game created by Rockstar. It has had a number of sequels over the years.
.b File Extension
Developer:
Rockstar Games
File category:
What are b files & how to open them - Grand Theft Auto III Save File
File category:
Developer:
Rockstar Games