.hxx
2 claimants
1 primary
1 secondary
unambiguous primary
SWH popularity
From the SWH-MSR-ARV dataset (Desmazières, Di Cosmo, Lorentz, MSR 2025; file nb_extensions_alphanum.csv) — one row per (ext, year) in the full SWH archive. Case-aggregated. citation.
2.0M
total occurrences
327.9K
since 2019 (16.3%)
1970–2023
years active
Case variants in archive: .hxx (2.0M), .HXX (4.1K), .hXX (192), .Hxx (93) — aggregated above.
Attribution status
This extension is attributed to C++ as primary by 1 authoritative claim.
Authoritative sources: △ Linguist · secondary △ Pygments · secondary ✓ Wikidata · Q2407 ✗ Wikipedia · no claim
Claimants (4)
Languages that list
.hxx among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| C++ | wikidata | primary |
| C++ | linguist | secondary |
| C++ | pygments | secondary |
| cpp | pygments | secondary |
Wikidata says… (2)
File formats, image formats, audio codecs and other non-PL
entities that claim
.hxx on Wikidata
(property P1195) or in the Wikipedia infobox.
Source: data/derived/external_extension_index.csv.
Click Use as new PL on any row to open the
Add-PL form pre-filled with that entry's name, Wikipedia/Wikidata
URL, and this extension — one submission creates the PL + claim.
| Format | Class (Wikidata P31) | Suggested label | MIME | Notes | Action |
|---|---|---|---|---|---|
| C header file Q29642901 file format | file format | — | — | — | Use as new PL ↗ |
| C++ header Q13039854 file format | file format | — | — | — | Use as new PL ↗ |
SWH-mined examples (0)
No archived examples for .hxx in our local mirror yet.