Shell extension fails to register on plain Win10

Copy Handler fails to register shell extension on fresh install of Win10 2004 (possibly on other too) - both 64 and 32 bit extensions are affected.

Originally reported on forum: https://forum.copyhandler.com/general-support-(english-only)/'unable-to-register-the-dllocx-regsvr32-failed-with-exit-code-0x5'/