Files with sfk extension can be usually encountered as temporary files generated to visualize audio waveforms in several Sony applications, including ACID, SoundForge or Vegas.

There is one other file type using
the SFK file extension!

empty icon.sfk - Modem Spy sound

Detailed description

Software that open sfk file

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SFK file extension - Sony audio waveform visualisation data

What is sfk file? How to open sfk files?

File type specification:

Temporary file type icon Temporary file type

File extension sfk is mainly related to a special type of temporary files created by Sony programs, such as ACID, SoundForge or Vegas.

The typical .sfk file contains visual data that help the program draw the audio waveform on the screen. Meant to speedup the process.

It appears that this file is mainly generated automatically when a song is put into a projects or when an audio file is opened.

For example CD Architect will always create an .sfk file automatically when you put a song into a project, whilst Sound Forge creates .sfk files when you open a file in "Direct Mode" and also creates these files when you save a .wav file and answer Yes to "Would you like to reopen the file in Direct Mode?"

You should be able to find some option menu that clears and deletes these files when the program is closed, but you can always delete them manually.

Updated: November 21, 2023

The default software associated to open sfk file:

Sound Forge icon

MAGIX AG logoSound Forge  Microsoft Windows software

Company or developer:

Sony Sound Forge (formerly known as Sonic Foundry Sound Forge) is a digital audio editing suite by Sony Creative Software which is aimed at the professional and semi-professional markets.

Help how to open:

This file type is generated automatically by the program, users are not meant to access or edit this file type manually.

How to convert:

It does not appear to be possible to convert or recover this type of temporary files.

Find converter to sfk file type:

mp3 to sfk

List of software applications associated to the .sfk file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open sfk file, edit sfk file, convert sfk file, view sfk file, play sfk file etc. (if exist software for corresponding action in's database).

Click on the tab below to simply browse between the application actions, to quickly get a list of recommended software, which is able to perform the specified software action, such as opening, editing or converting sfk files.

Programs that can create sfk file - Sony audio waveform visualisation data

Programs supporting the exension sfk on the main platforms Windows, Mac, Linux or mobile. Click on the link to get more information about listed programs for create sfk file action.

Microsoft Windows:

Main software associated with sfk file by default:
Sound Forge small icon Sound Forge
Other suggested software:
Vegas Pro small icon Vegas Pro
ACID Pro small icon ACID Pro
CD Architect small icon CD Architect

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