Thanks!
So the answer is that the rectifiers are now stored in
name.rect XML files:
Rectifier files are stored in your application data normally in the folder C:\Users\my_name\AppData\Roaming\psud2\rectifiers where?my_name?is your login name for Windows.?
I updated the rectifier database, which allowed me to download rectifiers.txt, but does it feed into the new
.rect files?