File extensions

Here are the file extensions that are used when developing programs in Pascal. In most cases, these are extensions used by the IDE (Lazarus) and the compiler (FPC).

Lazarus

Project files

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(2) Compiled code from other compilers (e.g. gcc) linked into a static library</td>

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Subversion or Git

These files would normally be stored in a repository as an adequate description of a project:

*.lpi
*.lpr
*.lfm
*.pas
*.pp

These files might contain manually-generated or imported information, or might be regenerated by the IDE or build process. In general, if they have the same basename as the project or a form or unit they're IDE-generated, but in all cases should be reviewed individually:

*.inc
*.res
*.lrs
*.rc
*.ico

These files are regenerated by the IDE or by a build so do not need to be stored:

*.ppu
*.o
*.a
*.lps
*.or
*.rst
*.compiled

Note that *.lrj files are generated for every form while tracking i18n, loss of these files can cause missing translations.

There is an example .gitignore file at 3.

Delphi

Project files

*.dfm
   Delphi form module
*.dof
   Delphi project options file
*.dsk
   Desktop configuration

Converting Delphi projects

Lazarus can convert at least some Delphi project files into its own format.

Application

General

*.txt
   Text file
*.po
   Gettext Portable Object
*.bak
   Backup
*.cfg
   Config file
*.chm
   Compiled Help File - contains html. See also package chm
*.csv
   Comma Separated Values text file format 
*.exe
   Directly executable program
*.hlp
   Help file
*.ini
   Initialization file
*.odt
   OpenDocument text document
*.pdf
   Portable Document Format
*.ps
   PostScript 
*.rtf
   Rich Text Format text file

Image

*.png
   Portable network graphic
*.bmp
   bitmap 
*.ico
   icon 
*.xpm
   pixmap 
*.ppm
   portable pixmap 
*.pgm
   portable graymap 
*.pbm
   portable bitmap 
*.jpg
   compressed image format standardised by the Joint Photographic Experts Group (JPEG)

XML

*.xml
*.dtd
*.xsd
*.xsl

Web

*.html
   Hypertext Markup Language
*.css
   Cascading style sheet

Archive

*.tar
   tape archive
*.zip
   a single file containing one or more compressed files

Database

*.dbf
   Database file
*.mdx
   Multiple index file

Spreadsheet

*.ods
   OpenOffice.org Calc spreadsheet File Format
*.xls  
   Microsoft Excel File Format
*.xlsx  
   Microsoft Office Open XML Excel File Format 

Operating system

Linux and Unix (excluding Darwin)

*.so 
   Shared object library
*.sh
   Shell script
*.deb
   Debian Package
*.rpm
   Red Hat Package Manager

Mac (Darwin)

*.app
   Application bundle (a structured directory)
*.dmg
   Disk Image File 
*.dylib 
   Dynamic shared library
*.framework
   Framework (set of interfaces or subframeworks)
*.icns
   Icon resource file containing one or more images used for an application icon 
*.plist
   Property list file (storage for serialised objects)

Windows

*.bat
   Batch file. It's a text file that contains a sequence of commands for a computer operating system.
*.dll 
  dynamic-link library
*.exe
   Directly executable program

See also

Alphabetical list of file extensions

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From the Free Pascal wiki, page "File extensions", as it stood on 2023-12-08 after a change by N7800, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.