Are you dealing with a DLL file? If you have never seen this file extension before or don’t know what to do with it, here we are. We are going to give you some comprehensive instructions to help you understand this file type. And apparently, we will help you open dll file on your computer. So, let’s read on and find out what is this file you are dealing with.

How To Open a Dll File: Easy Guide

What is .DLL File Extension

You can commonly find Dll files on your Windows computer and the particular extension has two file types. The first type is Dynamic Link Library and the other file type is DLL Dynamic Web Page. We are going to talk about both of the file types in this post.

Dll files consist of a set of data or drivers of a particular Windows program. These files contain information that other applications may need to do perform certain tasks. Moreover, these files help multiple applications to access some shared data through their common libraries. So, the Dynamic Link Library file which is the first type we are talking about is important only when required. These files are dynamically linked with another program and that programs can access the file only when it is important.

More About DLL File Extension

If you see a dll file on your computer, then it is added by Windows OS but other Windows programs can also add them. These dll files help other programs communicate with external devices like headphones, SD cards, etc. Moreover, the file format also helps other programs to read and write files. I will give you an example to tell how things work with a dll file extension.

Suppose, you are trying to print a document from your computer. You will go the default printer page and your system will call upon the .dll extension and it will let your printer print the particular page. Sometimes some Mac OS programs create these files and if you delete them, that particular program will behave badly. So due to that case, you cannot open or edit a dll file. But only certain applications will be able to use the file whenever required. And if the file is not okay or corrupted, the program will not work properly. So if something like that happens, reinstall the particular program or download dll files again. There are some common file types that use the same format with different names.

Common Dll Names

mfc42u.dll –  You will find this file in Windows XP, Windows Vista, and Windows 7. If you want to access its location, go to C:\Windows\System32\ and file the dll file. The full form of this file is Microsoft Foundation Class (MFC) library which is accessed by some Windows programs. But if your system shows that the file is missing, then the chance is, your Windows installation is not working. You can diagnose the problem through factory settings and try to open the file again.

mfc80u.dll– If your system shows that you are missing this file, you can reinstall the Microsoft Visual C++ 2005 Redistributable Package. And then the file will be there. The programs that need this file extension will generate it automatically.

mfc90u.dll– Another file of the same format is this one. If you have Microsoft Visual C++ 2008 Redistributable Package installed on your computer, you will find this file type. Visual C++ 2008 installs the format on your computer and if you are missing the file, simply reinstall the software.

mfc100u.dll- This one is created by Microsoft Visual C++ 2010 Redistributable Package and comes with the same. If your system shows that you are missing this file, simply reinstall the software. Or try to install the file instead.

How to Read Dll File Online?

Just like you open any file on your computer, double-click on your dll file. Or right-click on the file and choose an application to read it. But if you don’t know any software to open dll files for free, check the list below.

  • Client
  • Microsoft Windows
  • Microsoft Visual Studio 2019
  • Microsoft Visual FoxPro
  • Resource Hacker
  • 7-Zip

If you are using a Windows computer, these applications will help you open it.

How To Open a Dll File: Easy Guide

Details About DLL Dynamic Web Page

Microsoft IIS Web servers create DLL file extensions to generate HTML for certain web pages. These files must include the correct Perl or VB scripts that are important in the process. These scripts are required for the web page to successfully load on your browser. To open this file format, use a web browser on your computer.


If you are encountering errors while trying to open the dll file extension, download that missing file on your laptop. If you are encountering problems with a particular file, try to troubleshoot it first. If you need any assistance, drop your comment below.

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