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.
3.1M
total occurrences
1.7M
since 2019 (54.9%)
1997–2023
years active
Case variants in archive: .h5 (3.1M), .H5 (301) — aggregated above.
Attribution status
This extension is attributed to hdf — every claim across all sources (including secondary ones) points to a single language.
Authoritative sources:✗ Linguist · no claim✗ Pygments · no claim△ Wikidata · secondary✗ Wikipedia · no claim
File formats, image formats, audio codecs and other non-PL
entities that claim .h5 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.
Real archived programs with this extension, byte-verified against the SWH archive. Useful for deciding what this extension actually is when the attribution is uncertain.