.fsi
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.
41.4K
total occurrences
10.3K
since 2019 (24.8%)
2005–2023
years active
Case variants in archive: .fsi (41.4K), .FSI (3), .Fsi (2) — aggregated above.
Attribution status
This extension is attributed to F# as primary by 1 authoritative claim.
Authoritative sources: △ Linguist · secondary △ Pygments · secondary ✓ Wikidata · Q648619 ✗ Wikipedia · no claim
Claimants (3)
Languages that list
.fsi among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| F# | wikidata | primary |
| F# | linguist | secondary |
| F# | pygments | secondary |
SWH-mined examples (0)
No archived examples for .fsi in our local mirror yet.