Software⏱️ 2 min read📅 2026-05-31

How to Fix: api-ms-win-crt-runtime-l1-1-0.dll is missing when opening Microsoft Office file

Missing api-ms-win-crt-runtime-l1-1-0.dll error when opening Microsoft Office file.

Quick Answer: Try reinstalling Microsoft Office or running the Office Repair tool to fix the issue.

📋 Table of Contents

  1. 🔧 Proven Troubleshooting Steps
  2. ✨ Wrapping Up

The 'api-ms-win-crt-runtime-l1-1-0.dll' error is a common issue when opening Microsoft Office files. This .dll library is crucial for the runtime environment of Microsoft Office applications, and its absence can cause various problems.

🔧 Proven Troubleshooting Steps

Method 1: Reinstalling Microsoft Office

  1. Step 1: Open the 'Control Panel' and navigate to the 'Programs and Features' section.
  2. Step 2: Locate Microsoft Office in the list of installed programs, right-click on it, and select 'Uninstall'.
  3. Step 3: Wait for the uninstallation process to complete, then restart your computer.

Method 2: Registering the .dll Library

  1. Step 1: Open the 'Command Prompt' as an administrator by searching for it in the start menu.
  2. Step 2: Type the following command and press Enter: `regsvr32 /s api-ms-win-crt-runtime-l1-1-0.dll`
  3. Step 3: Wait for the registration process to complete, then restart your computer.

✨ Wrapping Up

By following these steps, you should be able to resolve the 'api-ms-win-crt-runtime-l1-1-0.dll' error and open your Microsoft Office file successfully.

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