SFD File

What are SFD files and how to open them

Are you having problems opening a SFD file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your SFD files.

What is a SFD file?

SFD files have multiple uses, and Amiga Symbolizer Function Definition is one of them. Read more about the other uses further down the page.

Amiga Symbolizer Function Definition

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open SFD files

Important: Different programs may use files with the SFD file extension for different purposes, so unless you are sure which format your SFD file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested ten different SFD openers which you will find listed below.

Last updated: August 13, 2026

All known file formats using extension .SFD

While Amiga Symbolizer Function Definition is a popular type of SFD-file, we know of 4 different uses of the .SFD file extension. Different software may use files with the same extension for different types of data.

Mozilla Spam Filter Definition

We know that one SFD format is Mozilla Spam Filter Definition. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Sofdec Video

Sofdec Video (.SFD) files are video/movie files created by CRI Middleware's Sofdec system, used in video game consoles like the Sega Dreamcast, Nintendo GameCube, Xbox, and similar platforms. These files store pre-rendered cinematic sequences (cutscenes, trailers, intros) used inside video games. Sofdec is a middleware tool invoked by game developers to encode and embed full-motion video with custom audio into game assets.

The format wraps standard MPEG video streams together with CRI's proprietary ADPCM audio codec (CRI ADX ADPCM) in an MPEG program stream container. Video frames are decoded using MPEG-1 style video, while audio is decoded via CRI ADX ADPCM. To view or use the video outside the game, converters like "sfd2mpg" can extract or convert the video-streamed content, but decoding often suffers from glitches (e.g. blocky output or wrong aspect ratio) because many tools do not fully support all variants of Sofdec files.

Files can be identified by certain internal byte sequences, for example the signature starting with bytes 0x000001BA21000100 at offset zero, and by strings such as "SOFDECSTREAM", ".SFA200", ".SFD200", and "VER." embedded in the data.

SFD opener for Windows

We have identified one SFD opener that is compatible with this specific type of SFD file.

Spline Font Database

We know that one SFD format is Spline Font Database. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Various apps that use files with this extension

These apps are known to open certain types of SFD files. Remember, different programs may use SFD files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about SFD file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.