Open lesson on DLL hijacking in Windows security context. We will cover how Windows searches for DLLs, why this mechanism becomes an attack vector, and what developer/administrator mistakes open pathways for library substitution. The session will show real cases, live demonstration of techniques, and defense approaches—from explicit load paths to code-signing and Safe DLL Search Mode. After the lesson, attendees will be able to assess their systems for DLL hijacking vulnerabilities and understand where risks arise. Format suits cybersecurity professionals, SOC analysts, and administrators looking to strengthen Windows environment control. Registration and practical defense guidance available at the provided link.