All about CFN Files

The CFN file type is primarily associated with AWS CloudFormation.

CFN	File extension: CFN
	File type:	text template file

What is a CFN file

CFN files mostly belong to AWS CloudFormation. CFN files can be used in two main ways:

AWS CloudFormation Template: These files contain formatted text (often JSON or YAML) to define cloud infrastructure. They let you describe resources and manage them as code in AWS.

Battery Measurement Data: At times, CFN files store power or battery data. Such files log measurements for analysis in tools like Battery Analyzer or BatteryMon.

If you open your CFN file in a simple text editor, look for structured syntax such as JSON or YAML to decide if it is a CloudFormation template. Otherwise, numeric data or log entries may indicate battery data. For more details on cloud templates, check out the AWS CloudFormation documentation.
FilExt.com note: This explanation uses targeted details so you can quickly assess your file's purpose and find the right tool for viewing or editing it.

How to open a CFN file

You need a suitable software like AWS CloudFormation to open a CFN file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CFN file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CFN file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CFN Text Viewer

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Online File Viewer

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Programs that open and convert CFN files:

AWS CloudFormation
See the previous paragraphs to learn more about the main application. CFN files are often referred to as AWS CloudFormation developers because this type of file is primarily created or used by this software.
Calamus (Font Data) by invers Software
Atari-based; Calamus SL is a frame based layout system for publishing purposes. The identifying characters used for this association are - Hex: 43 41 4C 41 4D 55 53 43 46 4E, ASCII: CALAMUSCFN.

Technical Data for CFN File Extension

File classification:

Developer

Identifier:

Hex: 43 41 4C 41 4D 55 53 43 46 4E, ASCII: CALAMUSCFN (provided by TrID database)

Related files:

yml, yaml, cnf, cfm, xml, zip, cvg, crg, _tf, json, cfg

Mime type:

application/octet-stream

a cfn text template file is a special file format and should only be edited and saved with the appropriate software.

How to solve problems with CFN files

Associate the CFN file extension with the correct application.
Update your software that should actually open text template files. Because only the current version supports the latest CFN file format. Search, therefore, e.g. on the manufacturer website after an available AWS CloudFormation update.
To make sure that your CFN file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CFN file online - secure, fast, and no downloads needed.