DPL File

What are DPL files and how to open them

Are you having problems opening a DPL file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your DPL files.

What is a DPL file?

DPL files have multiple uses, and Borland Component is one of them. Read more about the other uses further down the page.

Borland Component

Borland Component (.DPL) files are package libraries used in Borland Delphi 3 to bundle Delphi components, compiled units, and other reusable code into a single, loadable module. These files enable developers to distribute functionality that can be shared between Delphi projects without including source code in every project.

These libraries are built by the Delphi 3 IDE or compiler from package source files (.DPK). When compiled, the .DPL file behaves like a Windows DLL augmented with Delphi-specific metadata - such as a dependency table of units, exported class and procedure symbols, and a special entry point named RegisterModule that allows the Delphi IDE and runtime to integrate the package at design time or run time. After Delphi 3, the .DPL format was replaced by the .BPL extension starting with Delphi 4, and current Delphi development no longer produces .DPL files.

Technically, a .DPL file uses the Windows Portable Executable (PE) format typical of DLLs, beginning with the ASCII signature "MZ" at offset 0. It includes sections such as CODE, DATA, BSS, .idata, .edata, .rdata, .reloc, and .rsrc, and embeds strings including "This program must be run under Win32" and various Delphi VCL/Ezel symbols.

How to open DPL files

We have identified one DPL opener that is compatible with this specific type of DPL file.

Programs that open Borland Component files

Last updated: August 6, 2026

All known file formats using extension .DPL

While Borland Component is a popular type of DPL-file, we know of 2 different uses of the .DPL file extension. Different software may use files with the same extension for different types of data.

WINDEV Print Duplicate

We know that one DPL format is WINDEV Print Duplicate. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different DPL openers which you will find listed below.

Various apps that use files with this extension

These apps are known to open certain types of DPL files. Remember, different programs may use DPL files for different purposes, so you may need to try out a few of them to be able to open your specific file.

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