HKLM\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows <environment-name>\Print Processors\
The <processor-name> entry is a variable representing the subkey under the Print Processors subkey. It does not actually appear in the registry. This variable subkey displays information which is common to the subkeys in the Print Processors subkey.
The <processor-name> subkey contains configuration data for the print processor.