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.STK·File Extension

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

Data & Textapplication/hyperstudio

Quick facts

Extension.stk

File typeSTK Data & Text

MIME typeapplication/hyperstudio

CategoryData & Text

Charset—

Compressible—

What is .stk

What is a .stk file?

A .stk file is a STK 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/hyperstudio. When serving .stk over HTTP, set the Content-Type header as shown in Developer info below.

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

How to open .stk files

Use VS Code or Notepad++ to open and edit .stk 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/hyperstudio

Common software that reads/writes .stk:

VS CodeNotepad++Sublime Textjq

Relation chain

.stkextension of

format

STK Data & Textserved as

mime type

application/hyperstudiosent via header

http header

Related extensions

Related MIME types

application/hyperstudio

.stk

Common uses

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

How to edit .stk 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 .stk files

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

Frequently asked questions

What programs can open .stk 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 .stk file?

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

What is the relationship between .stk and the application/hyperstudio MIME type?

application/hyperstudio is the media type identifier used for .stk files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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