There are different ways to edit DLL files. And you'd better ask technicians for help or use professional and easy DLL file editor if you are a computer newbie. If you have the reason as above, you can try to edit the DLL file, or you are not supposed to do so.

You are a geek and want to see what it looks like inside.

You want to reverse engineer an application.

You want to extract Icons from the DLLs.

You attempt to hack it to do something other than what it was intended to do.

So you are required a bit of computer professional skills when editing it. They are written in many languages, such as C, C++, C#, Delphi, Visual Basic, Visual Basic.Net, and so forth. To edit DLL files is not as easy as you think. DLLs must be called from other code that is already executing.' 2 When need to edit DLL files? Unlike an executable (EXE) file, a DLL cannot be directly run. Programmers use DLLs to provide code that they can reuse and to parcel out distinct jobs. 'A Dynamic Link Library (DLL) is a file of code containing functions that can be called from other executable code (either an application or another DLL). Though there are different explanations given from Microsoft, this one could be the better one:

What is a dll file?