Download and install API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL to fix missing or corrupted dll errors.
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Leading Consensus
Company: Microsoft Corporation
Product: Microsoft® Windows® Operating System
Description: ApiSet Stub DLL
Metadata Consensus: 1 (100%)
Last Updated: Feb 5th, 2020
Microsoft Corporation (1)
Microsoft® Windows® Operating System (1)
ApiSet Stub DLL (1)
Dev Notes
User Attributions
viertual dj (13)64 bit (12)and 1 others...
The `API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL` is a part of the Windows operating system, created by Microsoft Corporation. It functions as an ApiSet Stub DLL, which is a component of the Windows API Sets, a system used to organize and expose various Windows APIs in a modular and consistent manner. This particular DLL is associated with versioning and functionality enhancements in Windows Error Reporting (WER), a feature that collects detailed information about application and system failures, and then reports these details to Microsoft for analysis and potential improvement of the OS. This DLL's role is to ensure compatibility and proper functioning of the WER system across different versions of Windows, helping to maintain system stability and support application error reporting. The `API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL` helps in abstracting the underlying implementations of these services, allowing developers to use them without worrying about the specifics of the system their application is running on.
Issues with this DLL could potentially disrupt the error reporting process or lead to system stability problems. To resolve problems related to this DLL, running a System File Checker (SFC) scan can help repair or replace corrupted or missing system files. Keeping the Windows OS updated is also crucial, as updates often include critical fixes and improvements for system files, including the ApiSet Stub DLLs. For more complex issues, seeking assistance from Microsoft Support or professional IT services may be necessary to ensure the system's integrity and functionality.
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When an application requires API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL, Windows will check the application and system folders for this .dll file. If the file is missing you may receive an error and the application may not function properly. To fix .dll errors, you can try a few basic steps. While some .dll errors might need more detailed fixes, these initial steps often solve common problems.

  • Re-Install the application that requires API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL.
  • Update the application to the latest version.
  • Install all Windows updates and any available driver updates.
  • Manually download and install API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL.
  • View more detailed .dll solutions and web tools.
.DLL Error Example:
This application has failed to start because API-MS-WIN-CORE-WINDOWSERRORREPORTING-L1-1-1.DLL was not found. Re-installing the application may fix this problem.


In some cases, you may need to register the .dll file. To register a .dll file, open the Command Prompt as an administrator, enter the folder containing the .dll file, and run the "regsvr32" command (see below). You'll receive a confirmation if the .dll file is successfully registered. For more detailed instructions, visit 'How to register .dll files using Windows RegSvr32'.
C:\User\Username>cd c:\windows\system32


Select the .dll version to download. In most cases, this would be the latest version (32/64-bit) from the appropriate company.

By company:  Microsoft Corporation (1),
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by Microsoft Corporation
for Microsoft® Windows® Operating System
ApiSet Stub DLL
6.3.9600.16384 (winblue_rtm.1308211623)
Product Version
1033 (U.S. English)

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