What is apphelp.dll?

The genuine apphelp.dll file is a software component of Application Compatibility Client Library by Microsoft.
The dynamic link library to support a helper function, this application runs with the Microsoft Application Compatibility Client. It assists Windows applications managed by the Application Compatibility Toolkit. The Application Compatibility Toolkit is a program that assists overall application management in Windows. Founded in 1975, Microsoft's flagship product is the Windows operating system, which is installed on over 90% of workstations worldwide.

AppHelp stands for Application Help

Apphelp.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. You can fix your apphelp.dll problem by downloading the correct apphelp.dll file. The following information can help you determine if apphelp.dll is a Windows system file or if it belongs to an application that you can trust.

Click to Run a Free Scan for apphelp.dll related errors

Apphelp.dll file information

The process known as Application Compatibility Client Library or Biblioteca de compatibilidad de aplicaciones cliente belongs to software Microsoft Windows Operating System or Sistema operativo Microsoft Windows by Microsoft (

Description: Apphelp.dll is not essential for Windows and will often cause problems. The file apphelp.dll is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 125,952 bytes (51% of all occurrences), 126,976 bytes and 5 more variants. 
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. The service has no detailed description. It can change the behavior of other programs or manipulate other programs. It is not a Windows system file. It is a Microsoft signed file. Therefore the technical security rating is 43% dangerous; however you should also read the user reviews.

Recommended: Identify apphelp.dll related errors

Important: Some malware camouflages itself as apphelp.dll. Therefore, you should check the apphelp.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

Caused my system to be a nice paperweight for a while.
I was able to fixed error "The application or DLL C:\Windows\system32\winspool.drv is not a valid Windows image"
  Olga   (further information)

Summary: Average user rating of apphelp.dll: based on 1 vote with 2 user comments. One user suspects danger. One user is not sure about it.

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Best practices for resolving apphelp issues

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

apphelp.dll [all]