Home · Extensions · .arff

`.arff`

1 claimant 1 primary 0 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.

3.1M

total occurrences

2.7M

since 2019 (87.6%)

2001–2023

years active

Case variants in archive: .arff (3.1M), .ARFF (459), .Arff (10) — aggregated above.

Attribution status

This extension is attributed to Attribute-Relation File Format; Attribute-Relation File Format as primary by 1 authoritative claim.

Authoritative sources: ✗ Linguist · no claim ✗ Pygments · no claim ✓ Wikidata · Q4489412 ✗ Wikipedia · no claim

Disagree or have a correction? Open a labelling issue.

Prior manual labels (1)

Label	Annotator	Status	Evidence (excerpt)
data:csv-tsv arff — ref	@acherm	new	Attribute-Relation File Format https://en.wikipedia.org/wiki/Weka_(software)#ARFF_file https://waikato.github.io/weka-wiki/formats_and_pro	discuss

Claimants (2)

Languages that list .arff among their extensions. Strength reflects whether the upstream source treated it as their primary extension.

Language	Source	Strength
Attribute-Relation File Format	repo_meta	primary
Attribute-Relation File Format	wikidata	primary

Wikidata says… (1)

File formats, image formats, audio codecs and other non-PL entities that claim .arff 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.

Right entry isn't listed? Add manually ↗

Format	Class (Wikidata `P31`)	Suggested label	MIME	Notes	Action
ARFF Q4489412 File format	file format	—	`—`	—	Use as new PL ↗

SWH-mined examples (1)

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.

sizes3.arff · 18467 B · seen 96× in SWH

predicted: unclassified via unknown-ext

swh:1:cnt:671112b3053bd8bc33f09872acc179ee529b9459;origin=https://github.com/milaan9/Clustering-Datasets;anchor=swh:1:rev:70f46c4700907ccbc39f1a425309dd086d38f3b7;path=/02. Synthetic/sizes3.arff

Open in SWH · Raw bytes