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Complete Guide: Finding api-ms-win-crt-filesystem-l1-1-0.dll on Your Computer

Learn how to locate, verify, and troubleshoot the missing api-ms-win-crt-filesystem-l1-1-0.dll file in Windows systems

Important Security Note:

Always download DLL files from official Microsoft sources. Third-party DLL download sites often distribute malware. Use our tool above to verify existing files before considering replacements.

What is api-ms-win-crt-filesystem-l1-1-0.dll?

The api-ms-win-crt-filesystem-l1-1-0.dll is a critical Windows system file that belongs to the Windows Universal CRT (C Runtime) components. This DLL provides filesystem-related functions that are used by many Windows applications and system processes. When this file is missing or corrupted, you may encounter errors like:

  • “The program can’t start because api-ms-win-crt-filesystem-l1-1-0.dll is missing”
  • “API-MS-Win-CRT-Filesystem-l1-1-0.dll not found”
  • “Error loading api-ms-win-crt-filesystem-l1-1-0.dll”
  • Application crashes with error code 0xc0000135

Official Locations of api-ms-win-crt-filesystem-l1-1-0.dll

Depending on your Windows version and architecture, this DLL should be located in one of these official paths:

Windows Version System Architecture Expected File Path File Size (approx.)
Windows 10/11 64-bit C:\Windows\System32\api-ms-win-crt-filesystem-l1-1-0.dll 12 KB
Windows 10/11 32-bit C:\Windows\SysWOW64\api-ms-win-crt-filesystem-l1-1-0.dll 10 KB
Windows 8/8.1 64-bit C:\Windows\System32\api-ms-win-crt-filesystem-l1-1-0.dll 11 KB
Windows 7 64-bit (with updates) C:\Windows\System32\api-ms-win-crt-filesystem-l1-1-0.dll 9 KB

Step-by-Step Guide to Find the DLL File

Method 1: Using Windows Search

  1. Press Win + S to open Windows Search
  2. Type “api-ms-win-crt-filesystem-l1-1-0.dll” (without quotes)
  3. Look for results in:
    • System32 folder (for 64-bit systems)
    • SysWOW64 folder (for 32-bit applications on 64-bit systems)
  4. If found, right-click and select “Open file location” to verify the path

Method 2: Manual Directory Check

  1. Open File Explorer (Win + E)
  2. Navigate to C:\Windows\System32
  3. In the search box (top-right), type “api-ms-win-crt-filesystem-l1-1-0.dll”
  4. If not found, navigate to C:\Windows\SysWOW64 and repeat the search
  5. For ARM64 systems, also check C:\Windows\SystemARM64

Method 3: Using Command Prompt

  1. Open Command Prompt as Administrator (Win + X > “Terminal (Admin)”)
  2. Run the following command: 
    dir /s C:\Windows\api-ms-win-crt-filesystem-l1-1-0.dll
  3. This will search all subdirectories of C:\Windows for the file
  4. For a more targeted search, use: 
    where /r C:\Windows api-ms-win-crt-filesystem-l1-1-0.dll

Verifying the DLL File Integrity

Finding the file is only the first step. You should verify its integrity to ensure it’s not corrupted:

Check File Version

  1. Right-click the DLL file and select “Properties”
  2. Go to the “Details” tab
  3. Look for:
    • File version (should match your Windows version)
    • Product version
    • Original filename
  4. For Windows 10/11, the version should be 10.0.xxxxx.xxxx

Check Digital Signature

  1. Right-click the DLL file and select “Properties”
  2. Go to the “Digital Signatures” tab
  3. You should see “Microsoft Windows” as the signer
  4. Click “Details” to view certificate information
  5. The certificate should be issued to “Microsoft Windows Production PCA” and by “Microsoft Root Certificate Authority”

Verify File Hash

You can compare the file’s hash with known good values from Microsoft:

  1. Open PowerShell as Administrator
  2. Run: 
    Get-FileHash C:\Windows\System32\api-ms-win-crt-filesystem-l1-1-0.dll -Algorithm SHA256 | Format-List
  3. Compare the hash with official Microsoft values (see resources below)
Official SHA-256 Hashes for api-ms-win-crt-filesystem-l1-1-0.dll
Windows Version Architecture Official SHA-256 Hash File Size
Windows 10 22H2 x64 A1B2C3D4E5F6… (example – use official sources) 12,288 bytes
Windows 11 23H2 x64 1A2B3C4D5E6F… (example – use official sources) 12,288 bytes
Windows 10 21H2 ARM64 5E6F7G8H9I0J… (example – use official sources) 11,776 bytes

Troubleshooting Missing or Corrupt api-ms-win-crt-filesystem-l1-1-0.dll

Common Causes of DLL Errors

  • Windows Updates: The file might be overwritten or deleted during an incomplete update
  • Malware Infections: Some malware replaces system DLLs with malicious versions
  • Hardware Failures: Bad sectors on your hard drive might corrupt system files
  • Software Conflicts: Some applications might incorrectly modify or delete system files
  • Manual Deletion: The file might have been accidentally deleted during “cleanup” operations

Official Repair Methods

Method 1: Run System File Checker (SFC)

  1. Open Command Prompt as Administrator
  2. Run the following command: 
    sfc /scannow
  3. Wait for the scan to complete (this may take 10-15 minutes)
  4. Restart your computer
  5. Check if the issue is resolved

Method 2: Use DISM (Deployment Image Servicing and Management)

  1. Open Command Prompt as Administrator
  2. Run the following commands in order: 
    DISM /Online /Cleanup-Image /CheckHealth
DISM /Online /Cleanup-Image /ScanHealth
DISM /Online /Cleanup-Image /RestoreHealth
  3. Each command may take several minutes to complete
  4. Restart your computer after all commands finish

Method 3: Repair Windows Universal CRT

  1. Download the official Microsoft Visual C++ Redistributable from: Microsoft’s official site
  2. Run the installer
  3. Select “Repair” when prompted
  4. Restart your computer

Method 4: Windows Update Repair

  1. Open Settings (> Update & Security > Windows Update)
  2. Click “View update history”
  3. Click “Uninstall updates”
  4. Look for recent updates that might have caused the issue (especially KB numbers)
  5. Uninstall suspicious updates and restart
  6. Check for new updates and install them

Advanced Troubleshooting

Manual DLL Replacement (Last Resort)

Warning:

Manual DLL replacement can cause system instability. Only attempt this if you’re experienced with Windows system files and have created a full system backup.

  1. Boot into Safe Mode (hold Shift while clicking Restart)
  2. Navigate to the appropriate System32 or SysWOW64 folder
  3. Rename the existing DLL file (if present) to “api-ms-win-crt-filesystem-l1-1-0.dll.bak”
  4. Obtain a clean copy from:
    • Another computer with the same Windows version
    • Windows installation media (mount the ISO and extract from sources)
    • Official Microsoft Update Catalog (catalog.update.microsoft.com)
  5. Copy the new DLL file to the appropriate folder
  6. Open Command Prompt as Administrator and run: 
    regsvr32 api-ms-win-crt-filesystem-l1-1-0.dll
  7. Restart your computer

System Restore

  1. Press Win + R, type “rstrui”, and press Enter
  2. Select a restore point from before the issue began
  3. Follow the on-screen instructions to restore your system
  4. After restoration, check if the DLL issue is resolved

In-Place Windows Upgrade

This method repairs Windows while keeping your files and applications:

  1. Download the Windows Media Creation Tool from Microsoft
  2. Run the tool and select “Upgrade this PC now”
  3. Follow the prompts to reinstall Windows while keeping your files
  4. This process may take 1-2 hours

Preventing Future DLL Issues

Best Practices for System Maintenance

  • Regular Updates: Keep Windows updated with the latest patches and security updates
  • Antivirus Protection: Use reputable antivirus software and keep it updated
  • System Backups: Maintain regular system image backups using Windows Backup or third-party tools
  • Disk Health: Monitor your hard drive health with tools like CrystalDiskInfo
  • Clean Installs: For major Windows version upgrades, consider clean installs rather than in-place upgrades
  • Software Sources: Only download software from official sources to avoid bundled malware

Monitoring System Files

You can proactively monitor your system files:

  1. Create a baseline of critical system files using: 
    sfc /verifyonly
  2. Use Windows Event Viewer to monitor system file changes
  3. Set up regular SFC scans (weekly or monthly)
  4. Consider using file integrity monitoring software for critical systems

Understanding Windows Component Store

The Windows Component Store (WinSxS) contains backup copies of all system files:

  • Location: C:\Windows\WinSxS
  • Contains multiple versions of system DLLs
  • Used by SFC and DISM for repairs
  • Can be cleaned up using: 
    DISM /Online /Cleanup-Image /AnalyzeComponentStore
DISM /Online /Cleanup-Image /StartComponentCleanup

Technical Deep Dive: How api-ms-win-crt-filesystem-l1-1-0.dll Works

DLL Architecture and Dependencies

The api-ms-win-crt-filesystem-l1-1-0.dll is part of the Windows API set architecture, which provides:

  • Abstraction Layer: Hides implementation details from applications
  • Version Independence: Allows applications to work across different Windows versions
  • Forwarding: The DLL typically forwards calls to the actual implementation in ucrtbase.dll

Key Functions Exported by the DLL

The DLL exports several critical filesystem functions:

Function Name Description Common Dependents
_wfindfirst64i32 Finds the first file in a directory search with 64-bit file sizes .NET applications, Installers
_wfindnext64i32 Continues a directory search started by _wfindfirst64i32 File managers, Backup software
_wstat64i32 Gets file status information with 64-bit support Development tools, System utilities
_wunlink Deletes a file (wide-character version) Cleanup tools, Temporary file managers

Dependency Chain

The DLL is part of a complex dependency chain:

Application.exe
    → api-ms-win-crt-filesystem-l1-1-0.dll
        → ucrtbase.dll
            → kernel32.dll
                → ntdll.dll

Performance Considerations

  • File Caching: Windows caches frequently used DLLs in memory
  • Forwarding Overhead: The API set forwarding adds minimal overhead (typically <1%)
  • 64-bit Advantages: 64-bit versions handle large files more efficiently
  • ARM64 Optimization: Native ARM64 versions are optimized for ARM processors

Security Aspects

  • Code Integrity: Protected by Windows Code Integrity (CI) policy
  • ACLs: Strict access control lists prevent unauthorized modification
  • Signature Verification: Windows verifies digital signatures on load
  • PatchGuard: Protected by Windows PatchGuard on 64-bit systems

Additional Resources and References

Official Microsoft Documentation

Academic Resources

Government Cybersecurity Guidelines

Community Resources

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