How to Fix .DLL Files

1. Download a decompiler. A decompiler is a program designed to take a .DLL file and allow the user not only to see but to make changes to the file's computer code. The decompiler physically breaks down the file into smaller parts, allowing you to edit each one individually. An example of a suitable decompiler is called Reflector.
2. Once you start the decompiler, you can click 'File' and 'Add' to select the .DLL you're going to be working with. Click the 'Decompile' button to let the program perform its task of breaking down the file. You can see the file's code from within the main Decompiler window.
3. Make your edits to the program's code. If you know enough to realize you need to edit the code to fix your .DLL, you know specifically what changes have to be made.
4. Recompile the file. After all your editing is done and you're confident with your changes, click the 'Recompile' button on the main decompiler window. This will take all of the individual files and reassemble them into the original .DLL.