Windows Print Processor Registry Key Location

In Windows, the registry stores configuration details for all core printing components, including print processor modules and their corresponding dynamic link libraries (DLLs). This guide outlines the exact registry paths within the Registry Editor (Regedit) where these print processors are registered and how their associated DLL files are cataloged across different system architectures.

The Print Processor Registry Path

The registered print processors and their DLL files are cataloged under the HKEY_LOCAL_MACHINE hive, categorized by the operating environment architecture.

Navigate to the following base path in Regedit:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Environments

Depending on your system’s architecture, expand the corresponding environment key:

• 64-bit (x64):
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows x64\Print Processors
• 32-bit (x86):
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows NT x86\Print Processors
• ARM64:
  HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Environments\Windows ARM64\Print Processors

How Modules and DLLs Are Cataloged

Inside the Print Processors key for the appropriate architecture, each registered print processor is listed as a subkey.

• Subkey Name: Represents the registered name of the print processor (for example, the default Windows print processor is named winprint). Custom or third-party print processors (such as those from HP, Canon, or PDF writers) will appear as separate subkeys alongside winprint.
• Driver Value: Inside each print processor subkey, there is a string value (REG_SZ) named Driver. The data assigned to this value specifies the filename of the dynamic link library (such as winprint.dll).

File System Location

While the registry key registers the module name and identifies the DLL filename, the actual dynamic library files referenced by these keys are physically stored in the Windows spool folder:

C:\Windows\System32\spool\prtprocs\[architecture]\

For example, on a 64-bit installation, winprint.dll is located at C:\Windows\System32\spool\prtprocs\x64\winprint.dll.