FileHint
JAEN

.xml

Use caution

Extensible Markup Language

A tag-based markup for structured data. Still everywhere — configs, RSS feeds, SOAP APIs, and Office Open XML packages.

MIME types

  • application/xml
  • text/xml

Category

data

What opens this file

  • VS Code
  • XMLSpy
  • Browsers
  • Oxygen XML

How to open by OS

Windows

  • VS Code, Notepad (slow on big files), browsers.

Mac

  • VS Code, browsers.

Linux

  • VS Code, xmllint, vim.

Ios

  • Koder.

Android

  • Acode.

Safety notes

  • XXE (XML External Entity) attacks can read arbitrary local files if the parser resolves external entities. Disable them server-side.
  • Billion Laughs and similar expansion attacks can DoS parsers; enforce entity-expansion limits.

Common mistakes

  • Mixing XML and HTML and forgetting to self-close void elements (<br/>, <img/>) — XML requires closure.
  • Shipping a UTF-8 BOM together with an XML declaration confuses some parsers.

Related extensions

References