Manifest - File Handlers

Used by packaged apps to specify what types of files the app can handle. An app can have multiple file_handlers, with each one having an identifier, a list of MIME types and/or a list of file extensions that can be handled, and a title. Here's an example of specifying file handlers:

"file_handlers": {
  "text": {
    "types": [
      "text/*"
    ],
    "title": "Text editor"
  },
  "image": {
    "types": [
      "image/png",
      "image/jpeg"
    ],
    "extensions": [
      "tiff"
    ],
    "title": "Image editor"
  },
  "any": {
    "extensions": [
      "*"
    ],
    "title": "Any file type editor"
  }
}

To handle files, apps also need to declare the fileSystem permission. Apps can then be passed files in the app.runtime.onLaunched event - either from the system file manager (currently supported on ChromeOS only) or by providing a path on the command line.