Microsoft Image Extension

import magic
# Libmagic relies on the OLE header and may mistakenly output 'application/CDFV2' or 'application/vnd.ms-office' instead of 'image/vnd.mix'
print(magic.from_file('project.mix', mime=True))

const FileType = require('file-type');
const type = await FileType.fromFile('project.mix');
console.log(type?.mime); // Parsers often mistake MIX for legacy Microsoft documents (.doc) due to the identical container signature.

import "net/http"
// http.DetectContentType will not reliably identify MIX. It detects the binary OLE header and usually falls back to 'application/octet-stream'.

$mime = mime_content_type('project.mix');
echo $mime; // Standard setups will often output 'application/octet-stream' or an Office MIME type