What is arcext.dll?

Arcext.dll is a Windows DLL file. DLL is the abbreviation for Dynamic Link Library. DLL files are needed by programs or web browser extensions, because they contain program code, data, and resources. The following information can help you determine if arcext.dll is a Windows system file or if it belongs to an application that you can trust.

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Arcext.dll file information

The process known as WinAce-Archiver Shell Extension belongs to software WinAce-Archiver by e-merge GmbH (

Description: Arcext.dll is not essential for the Windows OS and causes relatively few problems. The file arcext.dll is located in a subfolder of "C:\Program Files" (normally C:\Program Files\WINACE\). Known file sizes on Windows 10/8/7/XP are 166,912 bytes (59% of all occurrences), 165,888 bytes, 163,328 bytes or 162,304 bytes. 
A .dll file (Dynamic Link Library) is a special type of Windows program containing functions that other programs can call. This .dll file can be injected to all running processes and can change or manipulate their behavior. The program is not visible. There is no detailed description of this service. It can change the behavior of other programs or manipulate other programs. The arcext.dll file is not a Windows system file. Therefore the technical security rating is 66% dangerous, however you should also read the user reviews.

Uninstalling this variant: You can also do the following:
  • go to the support area [1][2] of the Winace website
  • verify that you have installed the latest version [1][2]
  • remove the entire program WinAce Archiver or WinAce Archiver at mailto:techsupport using Windows Control Panel

Recommended: Identify arcext.dll related errors

If arcext.dll is located in a subfolder of C:\, the security rating is 66% dangerous. The file size is 166,912 bytes (50% of all occurrences) or 112,640 bytes. It can change the behavior of other programs or manipulate other programs. The program has no visible window. There is no detailed description of this service. The file is not a Windows system file.

Important: Some malware camouflages itself as arcext.dll, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the arcext.dll 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

Used by WinAce to allow you to right-click in Explorer to perform archiving functions
Commercial file compression util.
  Ben!   (further information)
WinAce file. Not dangerous
Makes right click SLOW
  Alex   (further information)
It's a part of WinAce-Archiver.
  Dr. Ashley   (further information)

Summary: Average user rating of arcext.dll: based on 5 votes with 5 user comments. 4 users think arcext.dll is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous.

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Best practices for resolving arcext issues

A clean and tidy computer is the key requirement for avoiding problems with arcext. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic 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 6resmon 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 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the arcext.dll process on your computer, the following programs have proven to be helpful: ASecurity 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

arcext.dll [all]