Registry Server - REGSVR32.EXE
The
Regsvr32 tool is commonly run after installing new programs. It's an
application supplied by Microsoft to register new programming objects.
Usually it's run once for each new module installed by a new setup
program.
The parameter of Regsvr32 will be an OLE control such as a DLL, ActiveX component or other module with information that will be added to the Windows system registry. Regsrv32 is also used to "Un-Register" controls so it may also be seen when you properly uninstall a program.
Regsvr32
[/u] [/n] [/i[:cmdline]] dllname
/u - Unregister server
/i - Call DllInstall passing it an optional [cmdline]; when used with /u calls dll uninstall
/n - do not call DllRegisterServer; this option must be used with /i
Explanation of Regsvr32 Usage and Error Messages (Q183887)
Safe
Will usually remove itself
Microsoft.com