ADDING DXi.dll to X1 ???

I am trying to add PSYN II to X1 from 8.5, but it is not showing up.  

I have followed the advice online about entering the .dll into the regsvr32, but it won't work at all.  I am pretty sure I have spelled and provided the correct location for the psyn ii .dll.

When I run:  regsvr32"C:\Program Files\Cakewalk\Shared DXi\PSYNII.dll"   says I have not entered the correct name and gives me error codes even when I run as administrator.


What am I doing wrong ?

thanks,
matt