{
 "id": "capture-one-session-file",
 "name": "Capture One Session File",
 "category": "markup",
 "identifiers": {
  "extensions": [
   "cos"
  ],
  "puid": [
   "fmt/1857"
  ],
  "wikidata": [
   "Q118465354"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "3c3f786d6c2076657273696f6e3d",
    "notes": "Capture One Session File"
   }
  ],
  "signatures": [
   {
    "name": "Capture One Session File",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "3c3f786d6c2076657273696f6e3d(22|27)312e30(22|27)"
     },
     {
      "position": "bof",
      "offset": 22,
      "max_offset": 0,
      "pattern": "3c494d473e{0-256}3c45204b3d(22|27)417574686f72(22|27)"
     }
    ]
   }
  ],
  "priority_over": [
   "fmt/101",
   "fmt/1725"
  ]
 },
 "status": "unknown",
 "summary": "COS files are XML CaptureOne Session files which contain metadata for each image within a CaptureOne session. Capture One is a software for RAW photo editing geared for photography.",
 "tools": [
  {
   "name": "Capture One",
   "url": "http://www.phaseone.com/captureone/",
   "reads": true,
   "writes": true,
   "license": "proprietary license"
  }
 ],
 "projects": [
  {
   "name": "PRONOM fmt/1857",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/1857",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q118465354",
   "url": "https://www.wikidata.org/wiki/Q118465354",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-20",
 "aliases": [],
 "structure": [],
 "parsers": [],
 "conversions": [],
 "samples": [],
 "claims": [],
 "verification": []
}