Hi, The official media types (MIME types) for Apache Arrow formats are registered to IANA:
* https://www.iana.org/assignments/media-types/application/vnd.apache.arrow.file * https://www.iana.org/assignments/media-types/application/vnd.apache.arrow.stream We recommend ".arrow" for IPC file format file extension: https://arrow.apache.org/docs/format/Columnar.html#ipc-file-format and ".arrows" for IPC streaming format file extension: https://arrow.apache.org/docs/format/Columnar.html#ipc-streaming-format See also: * Discussion thread: https://lists.apache.org/thread.html/re80b8c87d472ceaa2a38a26f853bb278cff3ea01a3a119696a540eee%40%3Cdev.arrow.apache.org%3E Thanks, -- kou