You may be able to resolve missing or corrupted .dll errors by downloading and installing API-MS-WIN-CORE-LIBRARYLOADER-L1-2-1.DLL.

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The file API-MS-WIN-CORE-LIBRARYLOADER-L1-2-1.DLL is a Dynamic Link Library (DLL) file that is part of the Windows operating system, developed by Microsoft Corporation. This particular DLL file is known as an "ApiSet Stub DLL," and it serves as a part of the core library that assists with loading other libraries within the Windows environment.
The term "ApiSet Stub" essentially means that this DLL acts as a kind of placeholder or intermediary, directing calls from software applications to the appropriate system functions that they need to operate correctly. This modular approach allows software developers to call upon existing code in the operating system, reducing duplication and increasing efficiency. If you encounter errors associated with this DLL, such as "file not found" or "file corrupted," it generally indicates a serious issue with your Windows system that might affect its stability and functionality. Such errors could be due to various reasons like file corruption, malware infection, or even a faulty Windows update. Standard solutions for resolving these issues usually include running the built-in Windows system file checker (sfc /scannow), updating or reinstalling the operating system, or, in extreme cases, a complete system restore. As this is a core system file, you should not attempt to manually delete or alter it.
DLL research and information is supported by Artificial Intelligence and should be used as a helpful tool. However, it is important to keep in mind that this information may not be up-to-date or entirely accurate.


An error message indicating a .dll file is missing or corrupted can lead to a program malfunction or failure to launch. To address these issues, follow these steps:

  1. Update and restart: Confirm your computer has the latest Windows, software, and driver updates. After updating, reboot and double-check for any remaining updates. This often installs the missing .dll file to its proper location.
  2. Reinstall the software: Attempt to resolve the problem by reinstalling the software that is displaying the error. This process often restores the required .dll file to its designated location.
    1. For comprehensive troubleshooting guidance see 'How to fix .DLL errors'.
  3. Download the .DLL file: If reinstalling the software does not resolve the issue, download the .dll file from a reputable source and install the file manually.
    1. For comprehensive installation instructions see 'How to install .DLL files'.


1 Files Available Updated: Aug 24th, 2018
by Microsoft Corporation
for Microsoft® Windows® Operating System
ApiSet Stub DLL
6.3.9600.16384 (winblue_rtm.1308211623)
1033 (U.S. English)

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Windows .DLL Errors

  • This application has failed to start because API-MS-WIN-CORE-LIBRARYLOADER-L1-2-1.DLL was not found. Re-installing the application may fix this problem.

Did you know?

The Windows Registry holds references to .dll files. Errors might arise if these paths become corrupt or mismatched.