Delphi File Extensions

File extension	Type	Delphi Version	Description	Keep in Source Control?
.adt	?	Rad Studio 2010 enterprise and newer	QA Audit set file, the stored settings for a QA audit xx
.bdsdeploy	?		Deployment file
.bdsgroup	text/xml	Delphi BDS 2006 and earlier	BDS Project Group, combines several projects into a group. Only put under source control if you actually use that feature.	Maybe
.bdsproj	text/xml	Delphi BDS 2006 and earlier	Borland Developer Studio Project File. Successor of the .dof file holding compiler options etc. Also used for opening a project.	Yes
.bpg	text	Delphi 7 and older	Borland Project Group, combines several projects into a group. Only put under source control if you actually use that feature.	Maybe
.bpl	Binary	Delphi 4 and newer	Borland Package Library. DLL including VCL components available for use in the Delphi environment at design time or by applications at run time.	Maybe
.cbk	Other		Temporary Backup File.	No
.cfg	text	Delphi 7 and older	Project ConfigurationFile. The Delphi IDE (up to Version 7) automatically creates this file from the settings in the .DOF file. It is only used by the command line compiler. See command line compilation .	No
.config			Config files contain project option information and build logic. Each project has a .config file.
.d	text		Output of the project unit dependencies. This is generated by checking the "Output unit dependency information" compile option or passing "-depends" dcc32.exe.
.dcl	binary		Delphi Component Library
.dcp	Binary		Delphi Component Package. Contains symbol information for code compiled into a package. Used if building with runtime packages.	Maybe
.dcpil	Binary		Delphi Compiler Symbolic Information. The purpose of a .DCPIL file is to provide symbolic information to the compiler about certain language constructs that can't be reconstituted from CLR metadata alone. This is a traditional Delphi technique for handling and caching compiler symbols.	Maybe
.dcr	Resource		Delphi Component Resource File. Contains resource information for components, such as the icon to display in the palette.	Yes
.dcu	Binary	Win32	Delphi Compiled Unit File.	Maybe
.dcuil	Binary	.NET	Delphi Compiled Unit File	Maybe
.ddp	Other	Delphi 7 and older	Delphi Diagram Portfolio File. Used by the diagram editor.	Maybe
.dfm	binary or text		Delphi Win32 Form File. A file listing the various objects and their property values contained within a form, including such things as form control coordinates. Right click on the form and select View as Text from the pop-up menu to view this file. Manual alterations to this file may prevent the IDE from being able to load the form. Use the Environment Options dialog to specify which format to use for newly created forms. The text format is recommended as it better supports source control.	Yes
.dof	text	Delphi 7 and older	Delphi Project Options File. Text file containing project options (such as compiler and linker settings, version info, search path and output directories).	Yes (but beware: It might contain absolute paths)
.dpc	?		Delphi Package Collection
.dpk	text		Delphi Package Project	Yes
.dpkw	text		Delphi Package Project for Windows (Never seen in the wild)	Yes
.dpl	Binary	Delphi 3 and older	Delphi Package Library. Superseded by .bpl in later Delphi versions.	Maybe
.dpr	text	All Delphi versions	Delphi Project File. The main file for any project. Contains the source code of the main file for a Delphi project. It is the primary entry point for the executable and refers to the other source files in the project. Do not delete.	Yes
.dproj	text/xml	Delphi 2007 and newer	Delphi Project File for the native compiler. Contains the current settings for project options, such as compiler and linker settings, directories, conditional directives, and command-line parameters. Set these options using Project > Options. Replaces bdsproj file.	Yes (but beware: It might contain absolute paths)
.drc	text		Resource String File. Contains resource string information. Can be deleted; will be regenerated from source code by compiler.	No
.dres			Delphi compiled resource file.
.dsk	text		Delphi Desktop File. Contains information about the IDE desktop settings, including which files are open and the position of windows.	No
.dsm	Binary	Delphi 6?	Browser Symbol information from the last successful compile. Enviroment -> Preferences -> Desktop contents.	No
.dst			File used to save the desktop speed setting as set in the IDE toolbar desktop combo box. These files are stored in [users]\[username]\appdata\Roaming\[Borland/Codegear/Embarcadero]\BDS\[version] directory since Delphi 2007 and in the [Delphi install dir]\bin directory for older versions.
.groupproj	text/xml	Delphi 2007 and newer	Project Group File. Replaces .bdsgroup file.	Yes
.identcache	Binary		Temporary Cache File created by refactoring engine to improve performance.	No
.int	text		Interface part of Unit not shipped with source, typically in $(Delphi)\doc
.local	text/xml	Delphi 2005 and newer	User-specific project options. When using Starteam projects it will contain overrides to settings from the .bdsproj file.	No
.map	text		The optional error map file will contain a list of error addresses and source line numbers, grouped together for each source file in the application. To create a detailed .map file, ensure the {D+} compiler directive is set, and the "Detailed Map File" option selected in the Project >Options>Linker page of the IDE.	No
.mts	QA Metrics set file	Rad Studio 2010 enterprise or newer	The stored settings for QA metric
.nfm	Resource	Delphi 8.0 or newer	Delphi .NET Form File.	Yes
.pas	Source		Delphi Unit Source File.	Yes
.proj			Codegear RAD Studio project.	Yes
.res	Binary		Binary. 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
.resources	Binary		A binary resource file that can be embedded in a runtime executable.
.rsm	Binary		Remote Debugging Symbols file. Remote debugging enables you to debug one or more applications on a remote machine when the IDE is running only on your local machine. RSM files can be generated in Delphi 7.0 under Project Options -> Linker -> Include remote debug symbols	Maybe
.tlb	Binary		Type library.
.todo			The project to-do list.
.tvsconfig	text/xml		Modeling configuration file.
txvpck, txvcls			Information for model diagram.
.vlb	text/ini		Visual Live Bindings	Yes