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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.

What's New?

Detours Professional 3.0 is available for immediate purchase at the online Microsoft Store.  Detours Professional includes a commercial use license that allows the use of Detours in commercial products and in production environments.  Detours Professional includes support for either 32-bit or 64-bit processes on x86 and other Windows-compatible processors.

Detours Express 3.0 is available for immediate download under a no-fee, click-through license for research, non-commercial, and non-production use.  Detours Express is limited to 32-bit processes on x86 processors.

Detours 3.0 includes the following new features over Detours 2.x:

  • Support for 64-bit code on x64 and IA64 processors (Professional Edition only).
  • Support for all Windows processors (Professional Edition only).
  • Removed requirement for including detoured.dll in processes.
  • Compatibility improvements for detouring APIs used by managed-code (MSIL) programs, especially on x64 processors.
  • Addition of APIs to enumerate PE binary Imports and to determine the module referenced by a function pointer.


Innovative systems research hinges on the ability to easily instrument and extend existing operating system and application functionality. With access to appropriate source code, it is often trivial to insert new instrumentation or extensions by rebuilding the OS or application. However, in today's world systems researchers seldom have access to all relevant source code.

Detours is a library for instrumenting arbitrary Win32 functions Windows-compatible processors. Detours intercepts Win32 functions by re-writing the in-memory code for target functions. The Detours package also contains utilities to attach arbitrary DLLs and data segments (called payloads) to any Win32 binary.

Detours preserves the un-instrumented target function (callable through a trampoline) as a subroutine for use by the instrumentation. Our trampoline design enables a large class of innovative extensions to existing binary software.

We have used Detours to create an automatic distributed partitioning system, to instrument and analyze the DCOM protocol stack, and to create a thunking layer for a COM-based OS API. Detours is used widely within Microsoft and within the industry.