What is DUC40.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 DUC40.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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DUC40.exe file information

Windows Task Manager with DUC40
DUC40.exe process in Windows Task Manager

The process known as DUC40 belongs to software No-IP DUC or DUC40 by unknown.

Description: DUC40.exe is not essential for Windows and will often cause problems. DUC40.exe is located in a subfolder of "C:\Program Files" or sometimes in a subfolder of the user's profile folder. Known file sizes on Windows 10/8/7/XP are 270,336 bytes (35% of all occurrences), 346,624 bytes or 347,648 bytes. 
It is a file with no information about its developer. The file is not a Windows system file. The program has no visible window. The application starts upon Windows startup (see Registry key: Run). Therefore the technical security rating is 51% dangerous, however you should also read the user reviews.

Uninstalling this variant: You have the option to uninstall No-IP DUC software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7) or look for help from the software company No-ip.

Recommended: Identify DUC40.exe related errors

Important: Some malware camouflages itself as DUC40.exe. Therefore, you should check the DUC40.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

DUC40: DFMirage Driver. DFMirage mirror display driver allows TightVNC to gain the best performance under Windows. With DFMirage, TightVNC Server can detect screen updates and grab pixel data in a very efficient way. If you use TightVNC as free software, DFMirage is FREE for you as well.
  Butch Crockett   (further information)

Summary: Average user rating of DUC40.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 DUC40 issues

A clean and tidy computer is the key requirement for avoiding problems with DUC40. 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 DUC40.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

DUC40.exe [all]