# winsiderss/phnt

Native API header files for the System Informer project.

Repository: https://github.com/winsiderss/phnt
Canonical: https://ross.abutalabs.com/products/phnt
Homepage: https://systeminformer.io
Language: C
License: MIT
License Family: permissive
Topics: native, sdk, windows, wdk
Last push: 2026-03-26T00:14:55+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 74, release rhythm 35, longevity 100
- inputs: {"age_days": 2941, "days_push": 161, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1463, forks 220 (observed 2026-08-28T04:04:47.750988+00:00)

## What it is
A collection of Windows Native API (NT API) header files for user-mode C/C++ programs, maintained since 2009 for the Process Hacker/System Informer projects. It provides the most up-to-date Native API definitions gathered from Microsoft headers, symbol files, and reverse engineering.

## Use cases
- call undocumented Windows NT native APIs from user-mode code
- access Nt/Zw functions not exposed in the official Windows SDK
- target specific Windows versions from XP to Windows 11 with version-gated definitions
- build system internals tools like process monitors or malware analysis utilities
- reverse engineer Windows internals and need accurate NTAPI structures and enums

## When to choose
- you need Native API definitions more complete and current than the Windows SDK provides
- you are developing system-level Windows tools in C/C++
- you want a permissively licensed (MIT) header-only NTAPI SDK

## When to avoid
- you only need standard documented Win32 APIs available in the Windows SDK
- you are writing kernel-mode drivers (these headers target user-mode)
- you need cross-platform code that does not depend on Windows internals

## Facets
- artifact type: library
- maturity: active
- function: sdk, developer-tools, reverse-engineering
- domain: developer-tools, operating-systems, windows
- platform: windows, c, cpp
- tags: native-api, ntapi, headers, system-informer, process-hacker, wdk

## Member repositories
- winsiderss/phnt (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:47.750988+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:35:15.196442+00:00, confidence not recorded.
  - readme: https://github.com/winsiderss/phnt (fetched 2026-08-28T04:04:47.750988+00:00, sha a6e8aca3d856)
  - homepage: https://systeminformer.io (fetched 2026-08-29T11:43:41.922609+00:00, sha 78399cde8670)
  - site_page: https://systeminformer.io/about (fetched 2026-08-29T11:43:41.931753+00:00, sha 4df716767286)
- Data as of 2026-08-30T08:39:29.467469+00:00.