reg add HKCU\Software\Classes\CLSID\86CA1AA0-34AA-4E8B-A509-50C905BAE2A2\InprocServer32 /f /ve /t REG_SZ /d "C:\Path\To\Your\DLL.dll"
HKCU\Software\Classes\CLSID\86CA1AA0-34AA-4E8B-A509-50C905BAE2A2\InprocServer32 : This is the path where the change will be made.
The Windows registry is powerful, but HKCU\Software\Classes\CLSID abuse is a classic persistence and hijacking vector. Stay cautious, validate every GUID before modifying your registry, and keep your security software updated.
reg add "HKCU\Software\Classes\CLSID\86CA1AA0-34AA-4E8B-A509-50C905BAE2A2\InProcServer32" /ve /t REG_SZ /d "C:\Windows\System32\my_example.dll" /f
Technical and safety considerations
(You will need to restart Explorer again for this to take effect).