.msg
2 claimants
2 primary
0 secondary
shared primary (2)
SWH popularity
Distinct files in the full Software Heritage archive (2026-06-04 export), dated by first appearance, following Desmazières, Di Cosmo, Lorentz (MSR 2025). Case-aggregated. citation.
778.5K
total files
347.7K
first seen 2021–2025 (44.7%)
2020
median year (half its files since)
Case variants in archive: .msg (733.9K), .MSG (44.2K), .Msg (357) — aggregated above.
Attribution status
This extension is attributed to OMNeT++ MSG; ROS Interface as primary by 2 authoritative claims.
Authoritative sources: ✓ Linguist ✗ Pygments · no claim ✗ Wikidata · no claim ✗ Wikipedia · no claim
Claimants (2)
Languages that list
.msg among their extensions. Strength reflects whether the upstream source treated it as their primary extension.| Language | Source | Strength |
|---|---|---|
| OMNeT++ MSG | linguist | primary |
| ROS Interface | linguist | primary |
Wikidata says… (9)
File formats, image formats, audio codecs and other non-PL
entities that claim
.msg 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 |
|---|---|---|---|---|---|
| Adventure Game Toolkit Messages Q105862593 file format | file format | — | application/octet-stream | — | Use as new PL ↗ |
| Logistix Messages Q105863086 file format | file format | — | application/octet-stream | — | Use as new PL ↗ |
| Microsoft Outlook Email Message Q61707607 file format | file format | — | application/vnd.ms-outlook | — | Use as new PL ↗ |
Disambiguation rules (2)
Linguist heuristics that decide, by content, which language a
.msg file actually is.| Rule | Predicts | Kind | Predicates (truncated) | Measured on SWH |
|---|---|---|---|---|
h/linguist/.msg/0 | OMNeT++ MSG | predicates | [{"kind": "any", "regexes": ["^cplusplus\\(?[\\S]*\\)?[\\s]*\\{?\\{?|^namespace[\\s]+([^.\\s]*\\.)*[^.\\s]*;|^struct[\\s]+[\\S]+|^message[\\s]+[\\S]+(extends )?[\\S]*[\\s]*|^packet[\\s]+[\\S]+|^class[ | |
h/linguist/.msg/1 | ROS Interface | predicates | [{"kind": "any", "regexes": ["(?i)^[a-z]\\w*(?:\\/[a-z]\\w*)?(?:<=\\d+)?(?:\\[(?:<=\\d+)?\\])?\\s+\\w+\\b"]}, {"kind": "not_any", "regexes": ["^\\s*[^\\s@#\\w-]"]}] |
SWH-mined examples (0)
No archived examples for .msg in our local mirror yet.