HKLM\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows <environment-name>\Drivers\Version-<number>\
The <driver-name> subkey in the Version-<number> subkey contains information about necessary files and settings for the specified printer driver.
Note
The <driver-name> subkey is a variable representing the entries under the Version-number subkey. It does not actually appear in the registry. This variable subkey displays information which is common to the subkeys in the Version-number subkey.