---
title: ".dll file — what it is and how to open it"
description: "A .dll file is a Dynamic Link Library. Shared Windows code that programs load — not something you open or run. How to open one on Windows, macOS and Linux, and what to convert it to."
url: https://atoneplace.net/file/dll/
site: "At One Place"
---

# .dll files

**.dll file: Dynamic Link Library**

Shared Windows code that programs load — not something you open or run.

## What opens a .dll file

- **Windows:** Loaded automatically by programs (not opened directly), Dependency Walker / Dependencies (to inspect)
- **macOS:** Not applicable — Windows libraries
- **Linux:** Wine (when running Windows software)

## What a .dll file is

A DLL holds functions and resources that several Windows programs can share, loaded on demand rather than launched. Double-clicking does nothing useful, and a "missing DLL" error means a program cannot find one it expects — the fix is reinstalling that program or the relevant Microsoft Visual C++ redistributable, never downloading a loose DLL from a website, which is a well-worn malware trick.

## Details

- **Extension:** .dll
- **Full name:** Dynamic Link Library
- **Category:** Programs and installers
- **Created by:** Microsoft
- **Format:** Binary

## Common questions

### How do I open a .dll file?

On Windows use Loaded automatically by programs (not opened directly); on macOS use Not applicable — Windows libraries; on Linux use Wine (when running Windows software). Shared Windows code that programs load — not something you open or run.

### What is a .dll file?

Dynamic Link Library. A DLL holds functions and resources that several Windows programs can share, loaded on demand rather than launched. Double-clicking does nothing useful, and a "missing DLL" error means a program cannot find one it expects — the fix is reinstalling that program or the relevant Microsoft Visual C++ redistributable, never downloading a loose DLL from a website, which is a well-worn malware trick..

## Related pages

- [.exe — Windows Executable](https://atoneplace.net/file/exe/)
- [.apk — Android Application Package](https://atoneplace.net/file/apk/)
- [.msi — Windows Installer Package](https://atoneplace.net/file/msi/)
- [.sh — Shell Script](https://atoneplace.net/file/sh/)
- [.deb — Debian Software Package](https://atoneplace.net/file/deb/)
- [.jar — Java Archive](https://atoneplace.net/file/jar/)
- [.bat — Windows Batch File](https://atoneplace.net/file/bat/)
- [.pkg — macOS Installer Package](https://atoneplace.net/file/pkg/)
- [.ps1 — PowerShell Script](https://atoneplace.net/file/ps1/)
- [.ipa — iOS Application Archive](https://atoneplace.net/file/ipa/)
- [.rpm — RPM Package](https://atoneplace.net/file/rpm/)
- [.appimage — AppImage Portable Application](https://atoneplace.net/file/appimage/)

## Sources

- Media Types Registry — IANA (https://www.iana.org/assignments/media-types/)
- Official vendor product documentation — At One Place (/about/)