What is cnac4rpk.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the cnac4rpk.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Cnac4rpk.exe file information

Windows Task Manager with cnac4rpk
Cnac4rpk.exe process in Windows Task Manager

The process known as Canon Advanced Printing Technology RPC Server Process belongs to software Canon Advanced Printing Technology by CANON INC (

Description: Cnac4rpk.exe is not essential for Windows and will often cause problems. The cnac4rpk.exe file is located in the C:\Windows\System32 folder. The file size on Windows 10/8/7/XP is 57,407 bytes. 
The program is not visible. It is located in the Windows folder, but it is not a Windows core file. The file is not a Windows system file. The software listens for or sends data on open ports to a LAN or the Internet. Therefore the technical security rating is 70% dangerous, however you should also read the user reviews.

Recommended: Identify cnac4rpk.exe related errors

Important: Some malware camouflages itself as cnac4rpk.exe. Therefore, you should check the cnac4rpk.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

This belongs to Canon Advanced Printing Technology software

Summary: Average user rating of cnac4rpk.exe: based on 1 vote with 1 user comment. One user thinks it's neither essential nor dangerous.

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Best practices for resolving cnac4rpk issues

A clean and tidy computer is the key requirement for avoiding problems with cnac4rpk. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the cnac4rpk.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

cnac4rpk.exe [all]