Because .rar files from unofficial sources can be risky, any "piece" written for this should include a security disclaimer:
Extract the contents of ft-fix-repair-steam-generic-rar to your desktop. Run the repair.exe or script file as an Administrator. Restart Steam once the process is complete. ft-fix-repair-steam-generic-rar
"A comprehensive repair archive designed to troubleshoot common Steam connectivity and library recognition issues. This generic 'FT-FIX' bundle includes scripts to re-register Steam service components and flush corrupted temporary data without requiring a full reinstallation of your games." Option 3: A Community Warning (Safety First) Because
This is the standard piece that explains how to use such a repair file safely. Steam Generic Repair Utility ft-fix-repair-steam-generic-rar
Option 2: A Technical Description (For a Blog or Repository)