# Linux/macOS with Mono pedump --metadata /path/to/mscorlib.dll | head -20 If you see "Invalid PE file" or garbage, the file is corrupt.
sfc /scannow dism /online /cleanup-image /restorehealth Then reinstall .NET runtime from Microsoft’s website. This error is a stark reminder: mscorlib is the singularity of .NET — everything depends on it. When its metadata breaks, the entire virtual machine ceases to understand itself. Fixing it means restoring a clean, version-matched copy from a trusted source, not patching or hacking around it. 📎 Quick diagnostic command To check if your mscorlib.dll is readable:
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