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.LES·File Extension

LES Data & Text — A .les file is a LES Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Textapplication/vnd.hhe.lesson-player

Quick facts

Extension.les

File typeLES Data & Text

MIME typeapplication/vnd.hhe.lesson-player

CategoryData & Text

Charset—

Compressible—

What is .les

What is a .les file?

A .les file is a LES Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

In the mime-db registry it maps to application/vnd.hhe.lesson-player. When serving .les over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to application/vnd.hhe.lesson-player — and is delivered over HTTP via the Content-Type header.

How to open .les files

Use VS Code or Notepad++ to open and edit .les files.
Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

Content-Type: application/vnd.hhe.lesson-player

Common software that reads/writes .les:

VS CodeNotepad++Sublime Textjq

Relation chain

.lesextension of

format

LES Data & Textserved as

mime type

application/vnd.hhe.lesson-playersent via header

http header

Related extensions

Related MIME types

application/vnd.hhe.lesson-player

.les

Common uses

Configuration files
Data interchange between systems
API request and response payloads
Logs and data exports

How to edit .les files

Open the file with VS Code, make your changes and save.
Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .les files

Create a new file and save it with the .les extension, or export this format from VS Code.

Frequently asked questions

What programs can open .les files?

Common options include VS Code, Notepad++, Sublime Text. You can also open many of these files with built-in viewers or a browser.

How do I create a .les file?

Create a new file in any text editor or the app that owns the format and save it with the .les extension.

What is the relationship between .les and the application/vnd.hhe.lesson-player MIME type?

application/vnd.hhe.lesson-player is the media type identifier used for .les files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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