Fix ExtCommonApiU.DLL is missing/ not found error easily

Computer errors like ExtCommonApiU.DLL error is really annoying, as it really affects the performance of your computer system. Many people like you have encountered this error every so often. This article is designed to explain what ExtCommonApiU.DLL is, what causes this ExtCommonApiU.DLL error and the most important thing is how to fix this error. So let's begin.

Note: The manual fix requires sufficient computer know-how. If you're not confident of performing the manual fix, it's recommended that you use this Error Fix Tool to automatically fix the problem.

Overview of ExtCommonApiU.DLL File:

File Name:   
ExtCommonApiU.DLL (Free Scan)
File Description:   
ExtCommonApi DLL
Product Name:   
ExtCommonApi Dynamic Link Library
Product Version:   
3, 2, 0, 0
File md5:   
adb51506e073da3cceba90d2d63056df
File type:   
DLL file
OS Infected:   
Windows NT/2000/2003/XP/Vista/2008/7/8/10
Recommended:   
Download ExtCommonApiU.DLL Error Free Scan Tool

What's ExtCommonApiU.DLL Error?

ExtCommonApiU.DLL file is an important DLL file which belongs to ExtCommonApi Dynamic Link Library by ExtCommonApi Dynamic Link Library. This file ensures the Windows system and ExtCommonApi Dynamic Link Library perform properly. If you receive this error when you try to run a software or use a system function, you should know that your software or Windows system may have some issue. The corruption or deletion of ExtCommonApiU.DLL file will lead to ExtCommonApiU.DLL error when the software or Windows system call this file. Usually, you will not receive ExtCommonApiU.DLL error unless there is some issue with your file or Windows system.

What Causes ExtCommonApiU.DLL Error?

There are many possibilities that cause this ExtCommonApiU.DLL error.

  • ExtCommonApiU.DLL file was deleted when another program was uninstalled from your computer.
  • A new version of ExtCommonApiU.DLL file installed by another program is overwritten and is not compatible with other programs giving ExtCommonApiU.DLL error.
  • The ExtCommonApiU.DLL file was deliberately or mistakenly deleted by another computer user or program.
  • The registry entries of ExtCommonApiU.DLL file are corrupted.
  • There is a problem with a hardware.

How to Fix ExtCommonApiU.DLL Error?

Though computer error messages like ExtCommonApiU.DLL error are not dangerous, it could be a sign to a more serious problem. When Windows or software gives error messages, it means to attract your attention and needs you to fix the problem. In order to keep your PC perform properly, please follow the steps to fix your error:

Step 1. Run a virus scan over your system.

The first thing you need to ensure is that this error is not caused by computer malware. There are a lot of computer malware that could really attack your computer causing various issues. Malware infection may be the cause of ExtCommonApiU.DLL error. They are able to change or delete program files, and change program and system settings. To ensure this ExtCommonApiU.DLL error is not caused by computer malware, you'd better use your antivirus software and run a virus scan over your computer system.

Step 2. Re-register the ExtCommonApiU.DLL file.

If you ran a virus scan and do not find any malware on your computer, then you can re-register the ExtCommonApiU.DLL file. Usually, when a program is installed, it will register its files in the registry. If the ExtCommonApiU.DLL file is not properly registered, Windows or ExtCommonApi Dynamic Link Library will not be able to work correctly. To register ExtCommonApiU.DLL file,

2.1 Open an elevated command prompt.

Windows 7, Windows Vista and Windows 10:

Click Start, type cmd in the Search box, right click Command Prompt, and click Run as administrator. When User Account Control pops up, click Yes to continue.

Windows 8 and 8.1:

Swipe your mouse to the right edge of the screen, click Search, type cmd in the Search box, right click Command Prompt, and click Run as administrator. When User Account Control pops up, click Yes to continue.

2.2 In the command prompt window, type regsvr32 [full path of the ExtCommonApiU.DLL file]. An example is regsvr32 C:\Windows\System32\example.dll

2.3 After ExtCommonApiU.DLL is registered, it will give you a message telling you that it's successfully registered.

Step 3. Run SFC /scannow to repair system files.

System File Checker is a very useful Windows utility which can scan for corrupted Windows system files and then replace them. If your file is missing or not found, you can run System File Checker to get it back.

To do it,

3.1 Open an elevated command prompt.

Windows 7, Windows Vista and Windows 10

Click Start, type cmd in the Search box, right click Command Prompt, and click Run as administrator. When User Account Control pops up, click Yes to continue.

Windows 8 and 8.1

Swipe your mouse to the right edge of the screen, click Search, type cmd in the Search box, right click Command Prompt, and click Run as administrator. When User Account Control pops up, click Yes to continue.

3.2 In the command prompt window, type in sfc /scannow and then hit Enter key.

Wait until System File Checker scans and replaces all corrupted or missing files.

Step 4: Repair the registry.

If you've tried the steps above but cannot get ExtCommonApiU.DLL error fixed, then you can try to repair the registry. As it's known to all, the registry is the most important database where all settings of hardware and software on your computer is stored. Improper or incomplete software uninstallation can modify the registry and leave some invalid entries in the registry. When there is an issue in the registry, you can see some symptoms, such as DLL errors, EXE errors, and slow PC performance. It's not wise to manually look through the registry and fix it unless you're an experienced computer professional. A slightest mistake in the registry will lead to further damage to your system. The best and most recommended way to get your registry problems fixed is to run this brilliant fix tool. It will help you repair your registry and improve your PC performance.

Recommended: If you're not good at computers, it's recommended that you use this Automatic Error Fix Tool to fix this kind of problem.

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