Tech Tips

How to fix the Api-ms-win-crt-heap-l1-1-0.dll error?

Api-ms-win-crt-heap-l1-1-0.dll is a DLL (Dynamic Link Library) file developed by Microsoft that is essential system files to run the Windows OS operates smoothly. It is also known as ‘ApiSet Stub DLL’ that contains all the functions and procedures which ensure that Windows programs operate properly without any file missing errors.

Api-ms-win-crt-heap-l1-1-0.dll file is a part of the Microsoft Visual C++ Redistributable Package that is used by different programs like Microsoft Office or games and is called upon when required by the applications.

Like the other DLL files, this file is also located in the Windows System folders.

Microsoft Visual C++ Redistributable Package is a library file that is demanded by different applications to operate correctly. These packages are composed or developed in the C++ programming language.

Microsoft Visual C++ is an IDE (Integrated Development Environment) used to develop Windows applications using C, C++, and CLI programming languages. Microsoft Visual C++ Redistributable Package installs run-time components to run C++ applications and they are linked dynamically to Visual C++ libraries. These libraries install run-time components of these libraries: Standard C++, CRT(C Runtime), ATL, C++ AMP, MFC, OpenMP, and MSDIA.

Microsoft Visual C++ package utilizes shared libraries as lots of programs do. These packages are shared using smaller program files. These program files are generally distributed by third-party software developers which enhances the performance of apps and games. Therefore, they are called “Redistributable”

When you install a program, the setup file usually has the option to install the Visual C++ Redistributable package. On the other hand, if ten programs are sharing the Visual C++ Redistributable, then there’s not the need for installing multiple copies in your computer, instead a single copy is needed and is utilized by the programs on demand. There are different versions of Visual C++ Redistributable files. Thus, sometimes, you need to keep different versions of these files because different programs need the older versions as well to operate properly.

You can view all these filenames by going to Control Panel -> Programs -> Apps and Features on your computer. If you want to download the Visual C++ Redistributable package, then simply you can download from the internet depending on your computer versions viz. 32-bit or 64-bit operating systems. It means, if you have 32-bit OS, then you should download the 32-bit Visual C++ Redistributable package. But 64-bit OS supports both 32-bit and 64-bit Visual C++ Redistributable Packages.

Microsoft C++ is one of the most preferred programming languages because it makes things easier and maintains the raw speed. We know that most of the games are developed on Windows. Games require high performance and thus C++ is preferred as it delivers high performance. Thus, the necessary tool is Visual C++ which is used by software developers. 

What is the use of Microsoft Visual C++ Redistributable Package?

  • Microsoft Visual C++ Redistributable Package enhanced your system features associated with multimedia.
  • It can assist you to install the necessary file components automatically which are required by different applications or games.
  • This package helps the program developed by C++ programming language to operate properly.
  • Different Adobe Programs are developed using C++ programming language requiring this Microsoft Visual C++ Redistributable Package.

You may encounter the issue ‘Api-ms-win-crt-heap-l1-1-0.dll’ file is missing whenever you start applications/games. This error file doesn’t let your apps/games run smoothly. Look at the screenshot below.

To fix this issue, there are different troubleshooting steps which you can try:

#1. Download files from the internet:

This is a quick fix step. Simply, you can download the api-ms-win-crt-heap-l1-1-0.dll file and transfer it to the installation directory of the applications/games or copy it to the Windows system folder. This should fix your error. But you shouldn’t be downloading from unauthorized sources. Always download the files from the official or trusted sites.

#2. Perform Windows Update: 

This is the easiest and must-try troubleshooting step. If the error persists, you should update your Windows files. Open Windows Update by clicking the start button. Type Update in the search box, then choose either Windows Update or Check for Updates. Click the Check for updates button and wait till the Windows checks the new updates for your computer. You will notice there should be files related to Microsoft Visual C++ Redistributable Package. Different versions of this file not more than 20MB will be listed in a queue in the update lists. After updating, restart the computer and check to see if the problem disappears.

#3. Reinstalling the application:

If the above fix doesn’t work for you, then you should consider reinstalling the applications/games. There might be some internal system file issues that prevent the application from running properly. After reinstalling the applications, reboot your computer and it should fix your problems.


The Api-ms-win-crt-heap-l1-1-0.dll file is an important DLL file related to the Microsoft Visual C++ Redistributable package. Without this file, your applications/games wouldn’t operate properly. Thus, if this file is missing or you are getting any errors relating to this file, then consider the above troubleshooting fixes.

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