

No code emulation or virtualization occurs when running a Windows application under Wine. There is some confusion caused by an early FAQ using Windows Emulator and other invalid sources that appear after the Wine Project name being set. The selection of "Wine is Not an Emulator" as the name of the Wine Project was the result of a naming discussion in August 1993 and credited to David Niemi.

Wine is predominantly written using black-box testing reverse-engineering, to avoid copyright issues. Wine provides its compatibility layer for Windows runtime system (also called runtime environment) which translates Windows API calls into POSIX API calls, recreating the directory structure of Windows, and providing alternative implementations of Windows system libraries, system services through wineserver and various other components (such as Internet Explorer, the Windows Registry Editor, and msiexec).
