The list of the file extensions you see when Developing with Delphi continues ....

.CAB
This is the file format that Delphi offers its users for web deployment. The cabinet format is an efficient way to package multiple files.

.DB
Files with this extension are standard Paradox files.

.DBF
Files with this extension are standard dBASE files.

.GDB
Files with this extension are standard Interbase files.

.DBI
This text file contains initialization information for the Database Explorer.

   Caution
Never delete files with names ending in .dfm, .dpr, or .pas, unless you want to throw away your project. These files contain the application's properties and source code. When backing up an application, these are the critical files to save.