DirectUI

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DirectUI is a UI framework written in C++ for developing user interfaces for Microsoft Windows. This library is largely undocumented by Microsoft. It is used in Microsoft Office, Internet Explorer 8, and throughout the Windows shell. DirectUI is implemented in two libraries. In Windows XP, duser.dll was introduced. Windows 7 introduced a new DirectUI library, dui70.dll. The duser library is slowly being deprecated starting with Windows 10. The dui70 library implements many controls, or elements, that are used in DirectUI applications.

Applications that use DirectUI

Using dependency walker or Dependencies, we can determine which executables link against the duser and dui70 libraries. Here are some applications that are known to link against the DirectUI libraries.

Application	Publisher	Versions	duser.dll	dui70.dll
Word	Microsoft	2019+	Yes	Yes
Task Manager	Microsoft	6.2+	Yes	Yes