JPEG XR (HD Photo)

import magic
# Libmagic will reliably detect the '49 49 BC 01' header and identify it as JPEG XR
print(magic.from_file('photo.jxr', mime=True)) # Outputs 'image/vnd.ms-photo' or 'image/jxr'

const FileType = require('file-type');
const type = await FileType.fromFile('photo.wdp');
console.log(type.mime); // Will typically resolve to 'image/jxr' or 'image/vnd.ms-photo'

import (
    "bytes"
    "net/http"
)
// http.DetectContentType misses JPEG XR. Use a custom prefix check:
// isJXR := bytes.HasPrefix(buf, []byte{0x49, 0x49, 0xBC, 0x01})

$mime = mime_content_type('photo.jxr');
echo $mime; // Standard setups will often output 'image/vnd.ms-photo'