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.G3W·File Extension

G3W Data & Text — A .g3w file is a G3W Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Textapplication/vnd.geospace

Quick facts

Extension.g3w

File typeG3W Data & Text

MIME typeapplication/vnd.geospace

CategoryData & Text

Charset—

Compressible—

What is .g3w

What is a .g3w file?

A .g3w file is a G3W 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.geospace. When serving .g3w over HTTP, set the Content-Type header as shown in Developer info below.

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

How to open .g3w files

Use VS Code or Notepad++ to open and edit .g3w 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.geospace

Common software that reads/writes .g3w:

VS CodeNotepad++Sublime Textjq

Relation chain

.g3wextension of

format

G3W Data & Textserved as

mime type

application/vnd.geospacesent via header

http header

Related extensions

Related MIME types

application/vnd.geospace

.g3w

Common uses

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

How to edit .g3w 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 .g3w files

Create a new file and save it with the .g3w extension, or export this format from VS Code.

Frequently asked questions

What programs can open .g3w 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 .g3w file?

Create a new file in any text editor or the app that owns the format and save it with the .g3w extension.

What is the relationship between .g3w and the application/vnd.geospace MIME type?

application/vnd.geospace is the media type identifier used for .g3w files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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