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api-ms-win-core-rtlsupport-l1-1-0.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-rtlsupport-l1-1-0.dll

Publisher: Microsoft Corporation
Issuer: Microsoft Code Signing PCA
Encryption algorithm: SHA1
Time stamp: Apr 5 06:03:49 2018 GMT

The api-ms-win-core-rtlsupport-l1-1-0.dll is a Dynamic Link Library (DLL) file. DLLs are small files that contain code and data that can be used by multiple programs simultaneously to save memory space and resources.

MD5: 6a82bc4f0e9381d4add455380871ede8
SHA-1: 78876d860700bb2dd2c131bb20f96835697e085a
SHA-256: 36d7c565e81fc6f2dafdea7abffbac15ae2c894a6e87c5d785b98dd156b49fbd

Where it is used

This specific DLL is part of the Windows operating system and is utilized by various applications and components. It provides runtime support for functions related to the Real-Time Support (RTLS) layer, which includes tasks such as context switching, exception handling, and function table management.

Errors related to api-ms-win-core-rtlsupport-l1-1-0.dll

  • "api-ms-win-core-rtlsupport-l1-1-0.dll not found": This error occurs when the file is missing or corrupted. It may prevent certain applications from running properly.
  • "missing api-ms-win-core-rtlsupport-l1-1-0.dll": Similar to the above, this indicates that the DLL file could not be found during application startup or execution.
  • "error loading api-ms-win-core-rtlsupport-l1-1-0.dll": This error suggests issues with the file's integrity, such as being damaged or incompatible with your system version.

File security

The file is considered safe based on its characteristics and the known structure of Windows DLLs. However, any unexpected behavior should be investigated further to ensure that no malicious changes have been made to the file.

api-ms-win-core-rtlsupport-l1-1-0.dll was not found
The code execution cannot proceed because api-ms-win-core-rtlsupport-l1-1-0.dll was not found
Failed to load api-ms-win-core-rtlsupport-l1-1-0.dll
The procedure entry point ... could not be located in api-ms-win-core-rtlsupport-l1-1-0.dll

1.
2a. 👉 Try to copy api-ms-win-core-rtlsupport-l1-1-0.dll C:\Program Files\Your program\
2b. Also try to copy to bin, lib folders.
2c. Try to copy api-ms-win-core-rtlsupport-l1-1-0.dll C:\Program Files (x86)\Your program\
👉 Back up the files before you replace them.
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

  • Reinstall programs: If an application is causing issues, reinstalling it might resolve any missing or corrupted DLL files.
  • Update Windows: Ensuring your operating system is up-to-date can help fix compatibility and security issues that may affect DLLs.
  • Manually replace api-ms-win-core-rtlsupport-l1-1-0.dll: Ensure the version matches your Windows build to avoid conflicts.

FAQ

Q: Can I download api-ms-win-core-rtlsupport-l1-1-0.dll?
A: Yes, you can download it from official Microsoft sources. However, ensure the source is reputable and the version matches your system.

Conclusion

The api-ms-win-core-rtlsupport-l1-1-0.dll plays a crucial role in Windows systems by providing essential support for various components. Ensuring its integrity and availability can help maintain the stability of your applications.


File Description and Fixes for api-ms-win-core-rtlsupport-l1-1-0.dll

File Description

  • Name: api-ms-win-core-rtlsupport-l1-1-0.dll
  • Type: Dynamic Link Library (DLL)
  • Function: It is a core system component belonging to the Microsoft Windows Operating System. It exposes Run-Time Library (RTL) support functions used by application developers to manage memory, strings, and exception handling.
  • Architecture: Available in both 32-bit (x86) and 64-bit (x64) versions depending on your system and application requirements.

Standard File Location

The file is part of the Windows API sets and is typically located in the following directories:

  • 64-bit systems (for 64-bit files): C:\Windows\System32\
  • 64-bit systems (for 32-bit files): C:\Windows\SysWOW64\
  • 32-bit systems: C:\Windows\System32\
  • Alternative location: It can also be found directly inside the installation folder of the specific software or game that requires it.

How to Fix the Error Without Downloading the File

Do not download individual DLL files from third-party websites, as they often contain malware or outdated code. Use these official methods to resolve the missing error instead:

1. Run the System File Checker (SFC) and DISM Tools

Windows has built-in utilities to repair corrupted or missing system files automatically.

  • Type cmd in the Windows search bar.
  • Right-click Command Prompt and select Run as administrator.
  • Type DISM.exe /Online /Cleanup-image /Restorehealth and press Enter. Wait for it to finish.
  • Type sfc /scannow and press Enter.
  • Restart your computer after the verification reaches 100%.

2. Install or Repair Microsoft Visual C++ Redistributables

This DLL is heavily tied to the Windows runtime environments. Repairing the packages fixes most registry links.

  • Open the Control Panel and go to Programs and Features.
  • Look through the list for Microsoft Visual C++ Redistributable packages (specifically 2015-2022).
  • Click on the package, select Change, and then click Repair.
  • Repeat this for both x86 and x64 versions if you have a 64-bit OS.

3. Install Pending Windows Updates

API-set DLLs are frequently updated and distributed via Windows Update patches.

  • Open your Windows Settings (Win + I).
  • Navigate to Update & Security (or Windows Update).
  • Click Check for updates.
  • Download and install all critical and optional cumulative updates, then restart your PC.

4. Reinstall the Program Causing the Error

If the error occurs only when launching a specific app or game, that application's local files might be corrupted.

  • Uninstall the problematic software via Programs and Features.
  • Restart your device.
  • Reinstall the program using its official installer, which will automatically register its required dependencies.

Other versions:
️ api-ms-win-core-rtlsupport-l1-1-0.dll 10.0.17134.12 32-bit (x86)
Microsoft Corporation