Windows Enhanced Metafile

import magic
# Libmagic natively detects the 'Windows Enhanced Metafile' signature
print(magic.from_file('vector.emf', mime=True)) # Outputs 'image/x-emf'

const fs = require('fs');
// Manually detecting the EMF signature at offset 40
const buffer = Buffer.alloc(44);
const fd = fs.openSync('vector.emf', 'r');
fs.readSync(fd, buffer, 0, 44, 0);
fs.closeSync(fd);
// Check header type (0x01) and signature (' EMF')
const isEMF = buffer.readUInt32LE(0) === 1 && buffer.toString('ascii', 40, 44) === ' EMF';
console.log('Is Windows EMF:', isEMF);

import (
    "bytes"
    "os"
)
// Native Go HTTP detection does not recognize EMF.
// You must read the first 44 bytes and verify the signature at offset 40:
// isEMF := len(buf) >= 44 && bytes.Equal(buf[0:4], []byte{0x01, 0x00, 0x00, 0x00}) && bytes.Equal(buf[40:44], []byte(" EMF"))

$mime = mime_content_type('vector.emf');
echo $mime; // Depending on server definitions, often resolves to 'image/x-emf' or 'application/x-msmetafile'