What is Rundll.exe?

Rundll.exe is is an application that is used to launch functionality stored in shared 16-bit .dll files, because DLL (Dynamic Link Library) files can't be launched directly. This file is part of Microsoft Windows Operating System. Rundll.exe is developed by Microsoft Corporation. Rundll.exe is usually located in the %SYSTEM% sub-folder and its usual size is 19,456 bytes.

The rundll.exe process is a command line utility. Microsoft Windows 95, Windows 98, and Windows Millennium Edition (Me) contains two command-line utilities with this functionality - rundll.exe and rundll32.exe. Rundll.exe allows you to run 16-bit DLLs, whereas rundll32.exe runs 32-bit DLLs. Microsoft Windows NT 4.0 and newer versions contain only the rundll32.exe utility.

Important: RBOT-GSJ can mask itself as rundll.exe. Scan your computer with Auslogics Antivirus to make sure it’s not infected.

For more information on the rundll.exe command line functionality, please refer to this Microsoft article.