What is the Purpose of rundll32.exe and rundll.exe Commands on Windows?

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DLL files, or Dynamic Linked Libraries, are not meant to be opened or run directly by users. They serve as "helper programs" utilized by other software applications and are essential for the functioning of various programs and hardware drivers on a computer. Deleting DLL files is strongly discouraged unless the user is fully aware of their purpose, as they are critical components of software modules. Windows includes commands like rundll.exe and rundll32.exe, which enable users to invoke specific functions from DLLs that are designed for such calls. For more information on DLL file extensions, resources are available online.
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I've been seeing this certain file extension lately on my computer, but I do not know what programs to run them. What are file extension dll?
 
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DLL is most commonly a "Dynamic Linked Library". DLL files are not intended for users to open/run. They contain "helper programs" that are used by other programs.

Here is a helpful source for future reference : http://www.file-extensions.org/dll-file-extension
 
Never delete them...They also are used for hardware drivers on your computer too.
 
Let's just cut through it, they're modules (code) used in software. Don't delete them unless you know exactly what they do (chances are you don't in 99.99% of cases).
 
there is a command under Windows called rundll.exe and rundll32.exe

http://support.microsoft.com/kb/164787

that allow you to call functions from a DLL that are explicitly written to be called by them.
 

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