These files contain Windows API and Native API definitions adapted to use with Delphi. They include information from multiple sources, as marked per declaration:
- SDK - Windows Software Development Kit provides a significant portion of basic types plus non-ntdll function prototypes.
- WDK - Windows Driver Kit provides definitions for various system calls.
- DDK - Windows Driver Development Kit is an outdated version of WDK (from the times of Windows 7) that includes a few removed definitions.
- ADK - Windows Assessment and Deployment Kit includes DISM and WIM API definitions.
- DIA - Debug Interface Access SDK provides interfaces for working with debug symbols.
- MSDocs - Microsoft Documentation provides a few types and functions that do not appear in the official headers.
- MS-WINPROTLP - official Windows Protocol Specifications that thoroughly document RPC-based functions.
- PHNT - Process Hacker/System Informer Headers that contain a detailed collection of Native API definitions.
- ReactOS - an open-source operating system that is binary compatible with Windows.
- NtApiDotNet - a .NET library for system programming.