{
  "fileFormatID": 805,
  "formatName": "Icon file format",
  "version": null,
  "formatDescription": "This is an outline record only, and requires further details, research or authentication to provide information that will enable users to further understand the format and to assess digital preservation risks associated with it if appropriate. If you are able to help by supplying any additional information concerning this entry, please return to the main PRONOM page and select \u2018Add an Entry\u2019.",
  "releaseDate": null,
  "binaryFileFormat": "Text",
  "formatNote": null,
  "lastUpdatedDate": "11 Nov 2011",
  "formatProvenance": null,
  "formatSourceDate": "02 Feb 2007",
  "formatDisclosure": null,
  "formatEnvironment": null,
  "formatRisk": null,
  "formatAliases": null,
  "formatTypes": "Image (Raster)",
  "formatFamilies": null,
  "identifiers": [
    {
      "identifierText": "com.microsoft.ico",
      "identifierType": "Apple Uniform Type Identifier"
    },
    {
      "identifierText": "image/vnd.microsoft.icon",
      "identifierType": "MIME"
    },
    {
      "identifierText": "image/x-icon",
      "identifierType": "MIME"
    },
    {
      "identifierText": "x-fmt/418",
      "identifierType": "PUID"
    }
  ],
  "internalSignatures": [
    {
      "signatureID": 440,
      "name": "Icon file format",
      "note": "Header: (00000100) followed by number of images used in file. For purposes of this signature, range of limited to 1-9 - the largest number of images that was observed in any Icon file used for testing was 8. Header sequence followed by image directory, then sequence (000028000000{2}0000{2}00000100[01:20]0000000000)",
      "byteSequences": [
        {
          "positionType": "Absolute from BOF",
          "offset": 0,
          "maxOffset": null,
          "byteSequence": "00000100[01:09]00{3}00[00:01]00{1}00{3}00*000028000000{2}0000{2}00000100[01:20]0000000000",
          "endianness": null,
          "byteSequenceID": 554
        }
      ],
      "provenance": "Ongoing DROID research."
    }
  ],
  "externalSignatures": [
    {
      "externalSignature": "ico",
      "signatureType": "File extension"
    }
  ],
  "relationships": [],
  "submittedBy": [
    1
  ]
}