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api-ms-win-core-processthreads-l1-1-1.dll - Analyze and How to Fix Errors

★★★★★ Verified File (27.08.2026)

Description:Creation date: 20.11.2015 06:52:51
File version: 10.0.10586.15
Antivirus scan: ✅ OK
Category: System
File size: 19.4 kb.
Architecture: 64-bit (x64)
✅ This file is compatible with 64-bit Windows and ❌ will not work on a 32-bit operating system.
How to determine your system architecture: Press keys Win+R , enter symbols wmic os get osarchitecture , press Enter.

Digital file signature api-ms-win-core-processthreads-l1-1-1.dll

Publisher: Microsoft Corporation
Issuer: Microsoft Code Signing PCA
Encryption algorithm: SHA1
Time stamp: Apr 5 06:03:46 2018 GMT
The api-ms-win-core-processthreads-l1-1-1.dll is a dynamic-link library (DLL) file that is part of the Windows operating system. DLL files are essential components used by applications and services to share code, data, and resources without having to include them in each application separately.

MD5: 08e28a5be8f540c3598ae04efdf2b64a
SHA-1: 3c30db166db4d8db068c36eb4bbfa52b51d2e0ad
SHA-256: 3f839dd0fdc780c1099838c42d14675dbd350ad24fb5195f3ccbec1d3e93f182

Where it is used

This DLL file specifically supports system-level operations related to processes and threads. It contains functions for managing process and thread contexts, mitigations policies, and other core functionalities necessary for the smooth operation of Windows.

Some programs that may utilize this DLL include:

  • Windows Explorer
  • System Services
  • User Interface Subsystems
  • Security and Cryptography Libraries

File Security

The api-ms-win-core-processthreads-l1-1-1.dll is a core system file and is considered safe to use. It comes bundled with Windows and is updated regularly as part of Windows updates. However, if you encounter any unusual or unexpected behavior related to this DLL, it could indicate potential issues.

api-ms-win-core-processthreads-l1-1-1.dll was not found
The code execution cannot proceed because api-ms-win-core-processthreads-l1-1-1.dll was not found
Failed to load api-ms-win-core-processthreads-l1-1-1.dll
The procedure entry point ... could not be located in api-ms-win-core-processthreads-l1-1-1.dll

1.
2a. 👉 Try to copy api-ms-win-core-processthreads-l1-1-1.dll C:\Program Files\Your program\
2b. Also try to copy to bin, lib folders.
2c. Try to copy api-ms-win-core-processthreads-l1-1-1.dll C:\Program Files (x86)\Your program\
👉 Make sure to create backups before replacing the files.
How do I switch to the current Windows directory?
- Press and hold the key "win" on the keyboard and press the key "r" , then write %windir% and press the key Enter.
How to switch to the directory Program Files (x86) ?
- Press Win+R then enter %ProgramFiles(x86)% and after press Enter.

How to fix errors

If you experience errors with api-ms-win-core-processthreads-l1-1-1.dll, here are some steps you can take:

  1. Reinstall the program that uses this DLL. Sometimes, simply reinstalling the software will resolve any issues and ensure that all dependencies, including this DLL file, are properly installed.
  2. Update Windows. Ensure your operating system is up to date. Newer versions of Windows often include updates for core components like this DLL.
  3. Manually replace the api-ms-win-core-processthreads-l1-1-1.dll file (if necessary). You can download a fresh copy from official Microsoft sources or use the built-in system tools to repair missing files. However, proceed with caution and ensure you are using an authentic source.

FAQ

Q: Can I safely delete the api-ms-win-core-processthreads-l1-1-1.dll file?

A: No, this is a system file that should not be deleted. Deleting it could cause instability in your operating system.

Q: Where can I download an official version of api-ms-win-core-processthreads-l1-1-1.dll?

A: You can find the latest versions through Windows Update or from the official Microsoft Ensure you are downloading from a trusted source.

Conclusion

The api-ms-win-core-processthreads-l1-1-1.dll is an essential part of the Windows operating system, responsible for managing processes and threads. Issues with this DLL can be resolved through software reinstallation or updates. Always ensure you are using legitimate sources to avoid potential security risks.


File Description

The api-ms-win-core-processthreads-l1-1-1.dll is an ApiSet Stub DLL developed by Microsoft Corporation. It is a system-level component that belongs to the Universal C Runtime (UCRT) and the core Windows API sets. This file functions as a redirection proxy, routing calls from modern applications to the underlying Windows operating system kernels responsible for managing system processes and threads.

Standard File Locations

Depending on your Windows architecture, the file is natively stored in the following locations:

  • 64-bit systems (64-bit DLLs): C:\Windows\System32\
  • 64-bit systems (32-bit compatibility DLLs): C:\Windows\SysWOW64\
  • Fallback API Sets folder: C:\Windows\System32\downlevel\

How to Fix the Error Without Downloading the DLL File

Downloading standalone DLL files from third-party websites exposes your computer to security vulnerabilities, malware, or version mismatch issues. Use the following official native Windows utilities to restore the file safely:

1. Copy the File from the Local "Downlevel" Cache

Windows maintains a local backup cache of API set stubs natively on your hard drive.

  1. Open File Explorer and go to C:\Windows\System32\downlevel\.
  2. Search for api-ms-win-core-processthreads-l1-1-1.dll inside this folder.
  3. Right-click the file and select Copy.
  4. Paste the file directly into the installation folder of the program or game throwing the error.

2. Run the System File Checker (SFC)

The Windows built-in integrity scanner will replace missing or corrupted system files with healthy copies automatically.

  1. Press the Windows Key, type cmd, right-click Command Prompt, and select Run as administrator.
  2. Type the following command and press Enter:
    sfc /scannow
  3. Wait for the process to complete to 100%, then restart your computer.

3. Run the DISM Tool

If SFC fails to repair the files, use the Deployment Image Servicing and Management tool to repair the system image locally.

  1. Open Command Prompt as an administrator.
  2. Execute this command:
    DISM /Online /Cleanup-Image /RestoreHealth
  3. Run the sfc /scannow command one more time after DISM finishes.

4. Verify the Game or App Files

If the error occurs with a game or specific software launcher (such as Steam, Epic Games, or EA), you can use the platform's self-repair feature:

  1. Go to your Library within the application launcher.
  2. Right-click the affected application and select Properties or Settings.
  3. Choose Verify Integrity of Game Files, Repair, or Validate.

If the error persists, it could mean that the application requires a different subsystem update. Could you tell me what specific app or game triggers this error, and which Windows operating system version you are currently running?

Other versions:
️ api-ms-win-core-processthreads-l1-1-1.dll 10.0.17134.12 32-bit (x86)
Microsoft Corporation