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.ETX file extension

To open .ETX files on Windows, right-click the .ETX file → Open with → choose Notepad (or another text editor) to view the plain text.

To open an .ETX file, start by using a plain-text editor (Notepad, TextEdit in plain-text mode, or a Linux text editor). .ETX is widely used for Setext documents, which are ASCII text files, so you usually do not need special software just to view the contents.

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Last updated: June 11, 2026 · Reviewed by Julian Stricker

What “reviewed” means on this page
  • Format fit: whether the “what is this file?” description matches common real-world use of the extension, including category, typical MIME types, and aliases.
  • Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps; we remove fantasy menus and unsafe shortcuts.
  • Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
  • Sources and further reading: whether external links point to vendors, standards bodies, or other primary references where possible; we avoid inventing details we cannot ground.
  • Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless.

Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .ETX files

Use these platform-specific instructions to open .ETX files safely.

Windows

  1. Right-click the .ETX file → Open with → choose Notepad (or another text editor) to view the plain text.
  2. If you need formatted viewing, look for a Setext-capable viewer/converter (as referenced by file-type databases) and open the file there.
Full Windows guide

Mac

  1. Control-click the .ETX file → Open With → TextEdit, then ensure it opens as plain text (not rich text) to avoid altering content.
  2. If you require formatted rendering, use a Setext-capable tool (if available to you) rather than changing the file extension.
Full Mac guide

Linux

  1. Open the .ETX file with a text editor (for example, from the file manager with Open With → a text editor) to read the plain text.
  2. If your desktop uses shared-mime-info, the file may be recognized as text/x-setext; you can associate it with your preferred editor in your file manager.
Full Linux guide

iOS

  1. iOS may not have reliable Setext-aware apps by default; try opening it in the Files app to preview as text, or send it to a text editor app. If formatting is required, transfer it to a desktop text editor or Setext-capable tool.
Full iOS guide

Android

  1. Open the file using a text editor app to view the plain-text contents. If you need formatted output, move it to a desktop system and use a Setext-capable viewer/converter.
Full Android guide

Security notes

  • .ETX (Setext) is plain text and typically does not contain active content like macros, but it can still include misleading instructions or links if the content is untrusted.
  • Be cautious with Setext viewers/converters: like any parser, a buggy implementation could pose risk when processing untrusted input. If the source is unknown, open first in a basic text editor to inspect it.
  • Avoid “opening” an .ETX file by importing it into tools that execute external commands or scripts during conversion unless you trust both the tool and the document source.

If you did not expect this file

This extension is usually plain data, text, or structured content—not a program by itself. The practical risk is social engineering (a scam attachment or misleading filename). For trusted senders you rarely need heavy-handed antivirus wording; use these tools when you want an extra check on unexpected downloads.

Avast

Avast offers free and premium antivirus software that protects against viruses, malware, ransomware, and phishing. Scan files before opening them to ensure safety.

Norton

Norton 360 delivers comprehensive antivirus protection, VPN, and identity theft monitoring. Scan files for threats before opening to keep your device secure.

We may earn a commission when you use affiliate links. This supports our free file extension guides.

Can't open this file?

These are the most common causes and fixes when .ETX files fail to open.

Common reasons

  • The file opens as garbled text or wrong encoding
  • The file opens, but formatting looks “broken”
  • Your system doesn’t know what app to use

Fix steps

  1. In your text editor, try reopening the file with a different encoding (start with UTF-8, then try a legacy encoding if the source is old).
  2. If you obtained the file from an archive or mirror, re-download to ensure the copy is complete and unmodified.

OS-specific troubleshooting

What is a .ETX file?

.ETX most commonly refers to a Setext document (Structure Enhanced Text), a lightweight document markup format stored as plain ASCII text. The freedesktop shared MIME database associates .etx with the MIME type text/x-setext (“Setext document”). Because it is plain text, it is easy to inspect and process with text tools, though rendering/formatting may require a Setext-aware viewer or converter.

Background

Setext (Structure Enhanced Text) is a plain-text document format that predates many modern lightweight markup systems. Historical Setext documents indicate that Setext files are pure text and, by default, use the .etx/.ETX suffix.

In practice, many .ETX files are readable in any text editor because the underlying data is just text. If you need to view the document with formatting (rather than raw markup), you may need Setext-specific software; some resources list Setext viewers and also note that basic text editors can open the file.

You may encounter .etx examples in web/markup test collections; for example, W3C-hosted Setext-related test materials include sample .etx files. This reinforces that .ETX is typically a textual document used in markup and documentation workflows.

Common MIME types: text/x-setext

Further reading

Authoritative resources for more details on the .ETX format.

Common .ETX issues

The file opens as garbled text or wrong encoding

Setext documents are commonly ASCII plain text; if the file was saved with a different encoding or your editor guesses incorrectly, characters may look corrupted.

  1. In your text editor, try reopening the file with a different encoding (start with UTF-8, then try a legacy encoding if the source is old).
  2. If you obtained the file from an archive or mirror, re-download to ensure the copy is complete and unmodified.

The file opens, but formatting looks “broken”

A standard editor shows raw Setext markup rather than a rendered, formatted document.

  1. Confirm that the content is intended to be Setext by looking for lightweight markup patterns rather than binary data.
  2. Use a Setext-aware viewer/converter (where available) if you need a formatted view; otherwise, read it as plain text.

Your system doesn’t know what app to use

Some systems may not have a default association for .etx even though it is a recognized type (text/x-setext in shared-mime-info).

  1. Choose a text editor as the default application for .ETX files (any editor can open it as text).
  2. On Linux desktops, update the file association in your file manager; the type may appear as text/x-setext.

FAQ

Is .ETX just a text file?

In the most common usage, yes. .ETX is widely used for Setext documents, which are plain ASCII text files with lightweight markup.

What MIME type is associated with .etx on Linux?

In the freedesktop shared MIME database, .etx is associated with text/x-setext and described as a “Setext document.”

Can I convert .ETX by renaming it to .TXT or .HTML?

Renaming to .txt may help some apps treat it as plain text, but it does not convert the content. To create formatted output (like HTML), you need a Setext-aware viewer or conversion tool.

Where might I encounter real .ETX examples?

Setext documents are mirrored by Docutils, and W3C hosts Setext-related test materials that include example .etx files.

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