0

It works for me but I can't find evidence of it being officially supported so I'm concerned it may not work for everyone.

6

Yes, the flac audio format is supported. See the doc block for the function wp_get_mime_types() (and other mentions).

/**
 * Retrieve list of mime types and file extensions.
 *
 * @since 3.5.0
 * @since 4.2.0 Support was added for GIMP (.xcf) files.
 * @since 4.9.2 Support was added for Flac (.flac) files.
 * @since 4.9.6 Support was added for AAC (.aac) files.
 *
 * @return string[] Array of mime types keyed by the file extension regex corresponding to those types.
 */
function wp_get_mime_types() {

Whether the visitor's browser supports it is a completely different question and not in WordPress' hands.

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