What is WLHook.dll?

The genuine WLHook.dll file is a software component of AOL Desktop by AOL.
WLHook.dll is a DLL (Dynamic Link Library) file that belongs to AOL Desktop, an integration of a web browser, a media player and an instant messenger client. DLL files store data, code and resources needed by one or more programs in order to function correctly. This is not an essential Windows process and can be disabled if known to create problems. AOL Desktop is a set of software programs developed for users of AOL products. The suite offers AOL Mail, a mail application; Triton, an instant messaging client; and AOL Explorer, a browser based on Microsoft's Internet Explorer. The program also includes a universal address book including email and Internet telephony, as well as numerous security features. America Online (AOL) is an American telecommunications company that was established in 1985 by Jim Kimsey. It was originally called Quantum Computer Services and provided online services. AOL Inc. is based in New York City and develops and invests in web sites and brands. AOL distributes digital content, markets products, and offers numerous services to consumers, publishers, and advertisers.

WLHook stands for America Online Connectivity Services Session White List Hook

WLHook.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 WLHook.dll is a Windows system file or if it belongs to an application that you can trust.

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WLHook.dll file information

The process known as ACS Session White List Hook or AOL Connectivity Service Session List belongs to software AOL Connectivity Service or AOL Connectivity Services or AOL Uninstaller by America Online ( or AOL (

Description: WLHook.dll is not essential for the Windows OS and causes relatively few problems. The WLHook.dll file is located in a subfolder of "C:\Program Files\Common Files" (mainly C:\Program Files\Common Files\AOL\ACS\). Known file sizes on Windows 10/8/7/XP are 4,608 bytes (77% of all occurrences) or 10,288 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 has no visible window. There is no detailed description of this service. It can change the behavior of other programs or manipulate other programs. The file is not a Windows system file. WLHook.dll is able to record keyboard and mouse inputs. WLHook.dll appears to be a compressed file. Therefore the technical security rating is 60% dangerous, however you should also read the user reviews.

Uninstalling this variant: In case of problems with WLHook.dll, you can remove the entire program AOL Uninstaller or AOL Connectivity Services using Windows Control Panel.

Recommended: Identify WLHook.dll related errors

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

The process ACS Session White List Hook belongs to the software AOL Connectivity Service by America Online
Not enough info toe evaluate
  Maria Thompson  
agree , its a AOL communication setup file
  John Raams  
Kaspersky pick it up from AOL
WLHook.dll is from AOL connectivity processes. You will not be able to delete it until you end all AOL processes and exit the icon that is in your task bar.

Summary: Average user rating of WLHook.dll: based on 5 votes with 5 user comments. 3 users think WLHook.dll is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. One user suspects danger. 3 users don't grade WLHook.dll ("not sure about it").

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Best practices for resolving WLHook issues

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

WLHook.dll [all]