.clsFrom 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.
Case variants in archive: .cls (2.6M), .CLS (6.5K), .Cls (188), .CLs (1) — aggregated above.
This extension is attributed to Apex; ObjectScript as primary by 2 authoritative claims.
.cls among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| Apex | linguist | primary |
| ObjectScript | linguist | primary |
| Apex | pygments | secondary |
| ObjectScript | pygments | secondary |
| OpenEdge ABL | linguist | secondary |
| OpenEdge ABL | pygments | secondary |
| TeX | linguist | secondary |
| VBA | linguist | secondary |
| Visual Basic 6.0 | linguist | secondary |
| Visual Basic .NET | wikipedia | proposed |
.cls 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 |
|---|---|---|---|---|---|
| Visual Basic class definition Q105849998 file format | file format | — | — | — | Use as new PL ↗ |
.cls file actually is.| Rule | Predicts | Kind | Predicates (truncated) |
|---|---|---|---|
h/linguist/.cls/0 | Visual Basic 6.0 | predicates | [{"kind": "any", "regexes": ["^[ ]*VERSION [0-9]\\.[0-9] CLASS"]}, {"kind": "any", "regexes": ["^\\s*BEGIN(?:\\r?\\n|\\r)\\s*MultiUse\\s*=.*(?:\\r?\\n|\\r)\\s*Persistable\\s*="]}] |
h/linguist/.cls/1 | VBA | predicates | [{"kind": "any", "regexes": ["^[ ]*VERSION [0-9]\\.[0-9] CLASS"]}] |
h/linguist/.cls/2 | TeX | predicates | [{"kind": "any", "regexes": ["^\\s*\\\\(?:NeedsTeXFormat|ProvidesClass)\\{"]}] |
h/linguist/.cls/3 | ObjectScript | predicates | [{"kind": "any", "regexes": ["^Class\\s"]}] |
h/linguist/.cls/4 | OpenEdge ABL | predicates | [{"kind": "any", "regexes": ["(?i)^\\s*(?:end\\s+(?:class|interface)\\.|(?:class|interface)\\s+[a-z_][a-z0-9_#$%&-]*:)"]}] |