Win32

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Win32 is the 32bit Windows/ReactOS subsystem responsible for executing x86 executables.

The Core of the Win32 subsystem is found in the following modules

  • kernel32.dll (Base services)
  • gdi32.dll (Graphics Device Interface)
  • user32.dll (User interface)
  • win32k.sys (Kernel level support for the graphics device and user interfaces)

There are roughly 40 other libraries that make up the rest of Win32.

Wikipedia has a nice article with focus on the Windows API includong details about the win32 module structure.


See Arwinss page for the alternative win32 subsystem implementation effort.