FlashPix

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

const FileType = require('file-type');
const type = await FileType.fromFile('photo.fpx');
console.log(type?.mime); // Parsers often mistake FPX for legacy Microsoft documents (.doc, .xls) because they share the identical OLE container signature.

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

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