The db file extension is used in Windows operating system. DB file include thumbnail database. Thumbnail database is used to store thumbnail images for faster view of images in directory.
The DB file extension is used by various applications for database. There are specific languages that particularly implement it. As these files could be created by any application, the actual format of the file will vary.
File extension DB is associated with dBASE and dBFast. It is configuration file. It can be edited with a plain text editor.
The DB file extension is associated with Paradox. Paradox is Corel Corporation relational database management system, which is part of some editions of Corel WordPerfect Office suite.