Dependency Walker is a free utility that scans any 32-bit or 64-bit Windows module (exe, dll, ocx, sys, etc.) and builds a hierarchical tree diagram of all dependent modules. For each module found, it lists all the functions that are exported by that module, and which of those functions are actually being called by other modules. Another view displays the minimum set of required files, along with detailed information about each file including a full path to the file, base address, version numbers, machine type, debug information, and more.

Wikedia states that Dependency Walker was included in Microsoft Visual Studio until Visual Studio 2005 (Version 8.0) and Windows XP SP2 support tools. The utility was developed by Steve P. Miller, but is copyrighted to Microsoft. The latest version is 2.2.6000, released on October 29, 2006.

The following figure shows the dependencies of the TuxDroidServer program.

Dependency Walker version 2.2.6000, by Steve P. Miller