Question
How do I manually register a .DLL in my .MSI package?

Answer

To manually register a .DLL using regsvr32.exe in your .MSI package:

1. Go to MSI Script.
2. Add an Execute Program from Destination custom action after InstallFinalize in the Execute Immediate tab.
3. The Execute Program From Destination dialog appears. Fill in the following information:
   • Custom Action Name: Enter a name.
   • Working Directory: Enter SystemFolder.
   • EXE and Command Line: Enter the full path to regsvr32.exe and the full path to .DLL.
     Example: [SystemFolder]regsvr32.exe [WindowsFolder]Test.DLL
4. Accept all other defaults and click OK.
5. Ensure that the custom action has a condition around it so that it only executes when the installation is getting placed on the computer:
   
   If Not Installed 
        Execute Program from Destination
   End Statement
   
   Note: Add a separate custom action for each file.