How to Open DLL Files on Windows: 3 Easy Methods

What Is a DLL File?

A DLL (Dynamic Link Library) file contains code and data that Windows programs can load and use. Instead of including all their code in each program, applications can share functions through DLLs.

Windows and many applications rely on DLL files to work properly. Most DLLs run in the background when a program needs them, so users rarely need to open them manually. However, you may want to inspect a DLL's properties or examine its code when troubleshooting a program.

How to Open DLL Files on Windows

The right method depends on what you want to inspect. You can check a DLL's basic information, view code from a supported assembly, or examine its raw data.

Method 1. View DLL File Properties

If you only need to check a DLL's version or other basic details, Windows File Explorer is a good place to start. You do not need to install additional software.

• Open File Explorer and find your DLL file.

• Right-click the file and select "Properties".

• Open the "General" tab to check information such as the file's location and size.

  

• Select the "Details" tab, if available, to view information such as the file version, product name, or copyright details.

This lets you check a DLL's available metadata without opening its code. To inspect the code itself, use a decompiler.

Method 2. Open a DLL File with a Decompiler

A decompiler can translate compiled code into a more readable form. JetBrains dotPeek is one option for inspecting .NET assemblies, including supported DLL files.

Follow these steps to inspect a compatible DLL with dotPeek.

• Get the tool from the official JetBrains website and install it on your Windows computer.

• Launch dotPeek, select "File > Open", and browse to the DLL you want to inspect.

• Find the loaded assembly in Assembly Explorer and expand it to view its components.

  

• Select a class or method to display its code in the main viewing area.

DotPeek mainly supports .NET assemblies and may not display useful code for native DLLs or other unsupported files. Decompiled code may also differ from the original source code. If dotPeek cannot open your DLL, try a tool designed for its file format.

Method 3. View DLL Contents with a Text or Hex Editor

Text and hex editors let you examine and read DLL files, but they do not turn compiled code into a readable program.

Using a text editor

You can try opening the DLL in Notepad++ or another text editor. Because DLLs store compiled binary data, text editors display mostly unreadable characters, though you may spot a few recognizable text strings.

Using a hex editor

A hex editor displays the file's raw bytes in hexadecimal form. This can help you inspect binary data, but understanding the output requires more technical knowledge.

How to Recover Missing DLL Files

Missing DLL files can cause Windows applications to display errors or stop working properly. If a DLL was accidentally deleted, check the Recycle Bin or your backups first.

If you cannot find it, 4DDiG Data Recovery can scan the original drive for deleted or lost files, including supported DLL files. It supports over 2,000 file types, including DLL, EXE, SYS, OCX, and DRV files. You can also preview scan results before recovery to help identify the files you need.

• Install and open 4DDiG. Select the drive or partition where the missing DLL file was originally stored. 4DDiG will automatically start scanning for deleted and lost files.

  

• Wait for the scan to find the files. Use the file-type filters or search for the missing DLL's filename to locate it more quickly. If you do not remember the filename, browse the scan results for the file.

  

• Check the scan results for the missing DLL file. If preview is supported, preview the file before recovery. Select the DLL you want to restore and click "Recover."

  

• Choose a different drive or another safe location to save the recovered DLL file. Click "Save Now" to complete the recovery.

  

FAQs About Opening DLL Files

Can you open a DLL file in Notepad?

Yes, but DLL files contain compiled binary data, so Notepad usually displays garbled characters instead of readable code. You may still see a few recognizable text strings.

Can you run a DLL file like an EXE?

A DLL cannot usually run on its own like an EXE file. Applications and Windows components typically load DLLs and call the functions they provide. Double-clicking a DLL usually will not launch a program.

Is it safe to open a DLL file?

Checking a DLL's properties or viewing its contents is generally different from running its code. However, a DLL from an unknown source may contain malicious code. Only load DLL files from trusted sources.

Conclusion

Knowing how to open DLL files helps you choose the right method for checking file details or inspecting code. Use File Explorer for basic information and a suitable decompiler for supported assemblies. If a DLL has been deleted, 4DDiG can scan for files that may still be recoverable. Avoid changing system DLLs unless you understand the risks.