Rundll32 or Rundll32.exe is a Microsoft Windows command line utility that performs functions within a dynamic link library file. Rundll32 is responsible for running .dll files and placing the DLL libraries inside your computer system's memory. The Rundll32.exe is on Microsoft Windows versions 95, 98, 2000, XP, Vista and 7. To run a DLL as an EXE on your computer, you need to use a command line.
Press the "Start" button and click "Run."
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Type the letters "cmd" into the "Run" dialogue box. A command prompt window appears on your screen.
Type this command line into the command prompt window,"RUNDLL.EXE
Press "Enter" to run a DLL as an EXE.
When you execute the command into the command prompt, the .dll cannot contain any spaces or it will fail to execute.
Know the correct entry point of your .dll file before attempting to run it through Rundll32.