How to Edit DLL Files

1. Consider the reason you are attempting to edit a .DLL file. If it is a .DLL that is filled with icons, there are programs you can download that will do all the work for you. The program 'Reflector,' for example, has a setting under the 'Tools' menu for extracting icons. Load the file into the program and select this option. If this is your intended purpose, obtain one of these shareware programs from the Internet and your job is done (see Resources).
2. Obtain a .DLL decompiler. If you are editing the .DLL for any other reason than to take the icons out of it, you are going to need a piece of decompiler software. This is a program that will take the .DLL apart and make several different smaller parts out of it. Freeware programs that will work include W32DASM and Reflector (see Resources).
3. Run the decompiler. Once you start the program and tell it which file you are working with, it will then do its job and separate the file into a few workable parts. You can do this by selecting 'Add File' under the 'File' menu, and telling it which file you are working with. Then hit the 'Decompile' button on the main program window. You can then see the code and make any necessary changes from within the program itself.
4. Recompile the .DLL. Once you have finished your editing, you can tell the Decompiler software to take all the separate parts of the file it made and put them back together as one. Once the software is loaded into the Decompiler, select 'Recompile' from the 'File' menu to complete this operation.