| BDE | = Borland Database Engine. |
| BPG | = Borland Project Group |
| BPL | & DCP are Package Files. |
| CFG | = Delphi project configuration file, it has the projects options. |
| DBI | = Database Explorer Information |
| DCP | = Delphi Component Package. |
| DCT | = Delphi Component Templates |
| DCU | = Delphi Compiled Unit. |
| DEM | = Delphi Edit Mask |
| DFM | = Delphi Form File |
| DFN | = Integrated Translation Environment - there is one DFN for each form. |
| DLL | = Dynamic Link Library |
| DMT | = Delphi Menu Templates |
| DOF | = Delphi Option File. |
| DPC | = Package Collection File. |
| DPK | = Delphi PacKage. |
| DPL | = Delphi Package Library. |
| DPO | = Delphi Object Repository |
| DPR | = Delphi PRoject file. |
| DSK | = DeSKtop file. |
| DSM | = Delphi Symbol Module: |
| DST | = Desktop settings |
| DTI | = Design Time Information |
| EMF | = Enchanced Metafile Format. |
| GDI | = Graphics Device Interface. |
| IDAPI | = Integrated Database Application Programming Interface. |
| LIC | = License files that are related to an OCX file. |
| MDI | = Mutliple Document Interface. |
| OBJ | = Object file. |
| OCX | = OLE Control eXtension |
| PAS | = Delphi Unit is a .pas file, object PAScal. These are plain ASCII text files. |
| PCE | = Package Collection Editor File. |
| RES | = (RC) is a RESource file. |
| RPS | = Translation Repository |
| RTL | = Run Time Library. |
| SDI | = Single Document Interface. |
| TLB | = Type Library |
| VCL | = Visual Component Library. |
| Table files | Table files = .DBF, .DBT, .MDX, .NDX, .DB, .PX, .Y*, .X*, .MB, .VAL, .QBE |