How to Register and Unregister DLL Files Using the RegSvr32 Tool

RegSvr32 is a command-line utility included in Microsoft Windows that allows users to register and unregister system files, particularly .dll files. This is crucial for making certain functionalities available to software applications that rely on these files.

  1. Open the Command Prompt

    Open the command prompt as an Administrator.

    Windows Command Tool (CMD)
    Open Command Prompt as Administrator to use RegSvr32.
  2. Registering a DLL File

    To register the .dll file, use the command prompt to navigate to the folder containing the .dll file and then run the "regsvr32" command. You will receive a confirmation message if the .dll file is successfully registered.

    1. C:\User\Username>cd c:\windows\system32
    2. C:\Windows\System32>regsvr32 filename.dll

    If successful, you will see a confirmation dialog indicating that the DLL was registered successfully. If you encounter an error, ensure that the file path and command syntax are correct.

  3. Unregistering a DLL File

    Unregistering a DLL file removes its entry from the Windows registry, effectively disabling it from being used by applications. Note that some DLL files may not support unregistration.

    1. C:\User\Username>cd c:\windows\system32
    2. C:\Windows\System32>regsvr32.exe /u filename.dll

    If successful, you will see a confirmation dialog indicating that the DLL was unregistered successfully. If you encounter an error, verify the file path and command syntax.