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.F77·File Extension

F77 Data & Text — A .f77 file is a F77 Data & Text. It is a text-based data format widely used for configuration files, data interchange and API payloads.

Data & Texttext/x-fortran

Quick facts

Extension.f77

File typeF77 Data & Text

MIME typetext/x-fortran

CategoryData & Text

Charset—

Compressible—

What is .f77

What is a .f77 file?

A .f77 file is a F77 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 text/x-fortran. When serving .f77 over HTTP, set the Content-Type header as shown in Developer info below.

Related entities: it maps to text/x-fortran and is used by Fortran among others — and is delivered over HTTP via the Content-Type header.

How to open .f77 files

Use VS Code or Notepad++ to open and edit .f77 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: text/x-fortran

Common software that reads/writes .f77:

VS CodeNotepad++Sublime Textjq

Relation chain

.f77extension of

format

F77 Data & Textserved as

mime type

text/x-fortransent via header

http header

Related extensions

Related MIME types

Related programming languages

Fortran

.f .f77 .for

Common uses

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

How to edit .f77 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 .f77 files

Create a new file and save it with the .f77 extension, or export this format from VS Code.

Frequently asked questions

What programs can open .f77 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 .f77 file?

Create a new file in any text editor or the app that owns the format and save it with the .f77 extension.

What is the relationship between .f77 and the text/x-fortran MIME type?

text/x-fortran is the media type identifier used for .f77 files during network transfer (for example in the HTTP Content-Type header).

Sources & standards

Updated 2026-09-13

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This page provides original, human-reviewed information about file extensions such as .f77, the File Extension Reference and related concepts. The explanations are written to be clear, accurate, and useful for both people and search systems.

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