Delphi File Extensions

File extension	Type	Contents	Delphi Versions	Comments	Keep in Source Control?
.bdsgroup	Borland Developer Studio Project Group
.bdsdeploy	Deployment file
.bdsproj	Project	Borland Developer Studio Project File	Delphi 2005 or newer	Successor of the .dof file holding compiler options etc. Also used for opening a project.	Yes
.bpl	Binary	Borland Package Library	Delphi 4 and newer	A DLL including VCL components available for use in the Delphi environment at design time or by applications at run time.	Maybe
.cfg	Other	Project Configuration File			Yes
.dcp	Binary	Delphi Component Package		Contains symbol information for code compiled into a package.	Maybe
.dcr	Resource	Delphi Component Resource File		Contains resource information for components, such as the icon to display in the palette.	Yes
.dcu	Binary	Delphi Compiled Unit File	Win32		Maybe
.dcuil	Binary	Delphi Compiled Unit File	.NET		Maybe
.ddp	Other	Delphi Diagram Portfolio File	Delphi 7 or older	Used by the diagram editor.	Maybe
.dfm	Resource	Delphi Win32 Form File			Yes
.dpl	Binary	Delphi Package Library	Delphi 3 and older	Superseded by .bpl in later Delphi versions.	Maybe
.drc	Other	Resource String File		Contains resource string information. Can be deleted- will be regenerated from source code by compiler.	No
.dof	Other	Delphi Project Options File	Delphi7 or older	Text file containing project options (such as compiler and linker settings).	Yes
.dpk	Project		Delphi Package Source File		Yes
.dpkw
.dpr	Project	Delphi Project File	all Delphi Versions	Contains the source code of the main program.	Yes
.dsk	IDE	Delphi Desktop File		Contains information about the desktop settings, including which files are open and the position of windows.	No
.identcache	IDE			Temporary cache file created by refactoring engine to improve performance.	No
.local	Other			User-specific project options. When using Starteam projects it will contain overrides to settings from the .bdsproj file.	No
.nfm	Resource	Delphi .NET Form File	Delphi 8.0 or newer		Yes
.pas	Source	Delphi Unit Source File			Yes
.res	Resource	Resource File		Binary file associated with a project containing resource definitions, such as strings, icons, images etc. This file will be recreated by the IDE when loading a project but the icon will get lost in that process. Therefore you should either keep it in source control or find another way to create it.	Yes