Software package for re-routing Win32 APIs underneath applications. Under commercial release for over 10 years, Detours is licensed by over 100 ISVs and used within nearly every product team at Microsoft. Microsoft Research Detours v3 Professional is a library for instrumenting arbitrary Win32 functions on x86, x64, and IA64 machines. Now you can intercept Win32 functions by re-writing the in-memory code for target functions.