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0x80131534SystemMedium

Error 0x80131534 — File Not Found (.NET COR_E_FILENOTFOUND) | Windows System Error Fix

Windows 11Windows 10Windows 8.1

What Does 0x80131534 Mean?

A .NET assembly or file referenced by the application could not be found.

Real-World Causes

  1. 1Required .NET assembly DLL is missing from the application directory
  2. 2Application was partially installed
  3. 3Antivirus quarantined a .NET DLL
  4. 4.NET Global Assembly Cache (GAC) is corrupted

Symptoms

  • ⚠.NET application crashes with FileNotFoundException
  • ⚠Application fails on startup referencing a missing assembly
  • ⚠Fusion log shows assembly binding failure
  • ⚠Error mentions a specific DLL or assembly name

DIY Fix

Beginner-friendly steps you can try at home

  1. 1Reinstall the application to restore missing files
  2. 2Check antivirus quarantine for removed DLLs
  3. 3Repair .NET Framework installation
  4. 4Install the required .NET Framework version

Advanced Fix

For experienced users and IT professionals

  1. 1Enable Fusion Assembly Binding Log Viewer (fuslogvw.exe) to diagnose assembly loading failures
  2. 2Check GAC integrity: 'gacutil -l' to list registered assemblies
  3. 3Reinstall the specific missing assembly

Frequently Asked Questions

What is a .NET assembly?
A .NET assembly is a compiled code library (DLL or EXE) used by .NET applications. If an assembly is missing, the application cannot find the code it needs to run. Reinstalling the application usually restores all required assemblies.

Related Error Codes

0x80131509Exception (.NET COR_E_EXCEPTION)0x80131500System Exception (.NET COR_E_SYSTEM)

About the Author

Windows Troubleshooting Team

Verified against official Microsoft documentation and real-world diagnostic data. Error behavior confirmed across Windows 10, Windows 11, and Windows Server.