Windows Metafile

import magic
# Libmagic can identify WMF files using the APM or GDI headers
print(magic.from_file('clipart.wmf', mime=True)) # Outputs 'image/x-wmf' or 'image/wmf'

const fs = require('fs');
// Manually checking for the Aldus Placeable Metafile header (D7 CD C6 9A)
const buffer = Buffer.alloc(4);
const fd = fs.openSync('clipart.wmf', 'r');
fs.readSync(fd, buffer, 0, 4, 0);
fs.closeSync(fd);
const isWMF = (buffer[0] === 0xD7 && buffer[1] === 0xCD && buffer[2] === 0xC6 && buffer[3] === 0x9A) || (buffer[0] === 0x01 && buffer[1] === 0x00);
console.log('Is Windows Metafile (WMF):', isWMF);

import (
    "bytes"
    "net/http"
)
// Native Go HTTP detection does not recognize WMF.
// Check directly for the APM or GDI signatures:
// isWMF := bytes.HasPrefix(buf, []byte{0xD7, 0xCD, 0xC6, 0x9A}) || bytes.HasPrefix(buf, []byte{0x01, 0x00, 0x09, 0x00})

$mime = mime_content_type('clipart.wmf');
echo $mime; // Standard PHP setups will return 'image/x-wmf' or 'image/wmf' depending on the system magic database