North American Presentation Level Protocol Syntax

import magic
# Libmagic will frequently fail to identify NAPLPS accurately, falling back to 'text/plain' or 'application/octet-stream' due to the ASCII control codes.
print(magic.from_file('graphic.nap', mime=True))

const FileType = require('file-type');
const type = await FileType.fromFile('graphic.nap');
console.log(type?.mime); // Modern libraries usually do not carry definitions for NAPLPS.

import "net/http"
// http.DetectContentType will not recognize the geometric instruction sets and will generally default to "application/octet-stream".

$mime = mime_content_type('graphic.nap');
echo $mime; // Standard setups will likely report generic text or binary types depending on the initial bytes.