DFF File

What are DFF files and how to open them

Are you having problems opening a DFF 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 DFF files.

What is a DFF file?

DFF files have multiple uses, and DFF Structured Binary Data is one of them. Read more about the other uses further down the page.

DFF Structured Binary Data File

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 DFF files

Important: Different programs may use files with the DFF file extension for different purposes, so unless you are sure which format your DFF 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 DFF openers which you will find listed below.

Last updated: October 27, 2026

All known file formats using extension .DFF

While DFF Structured Binary Data File is a popular type of DFF-file, we know of 5 different uses of the .DFF file extension. Different software may use files with the same extension for different types of data.

Direct Stream Digital Interchange File Format Audio

Direct Stream Digital Interchange File Format Audio is a professional audio file format used mainly in the production and mastering of high-resolution sound recordings. It serves as a way for studios and mastering engineers to store or exchange Direct Stream Digital (DSD) audio content before final reproduction, especially in creating Super Audio CDs (SACDs). The format supports both raw one-bit DSD streams and a lossless compression variant called Direct Stream Transfer (DST) in order to provide flexibility during editing, archiving, and delivery.

Files in this format are written according to the DSDIFF specification version 1.5 (released in April 2004 by Philips), which defines a chunked file structure based on the IFF/AIFF model. The format is intended to hold edited master recordings, possibly comprising multiple tracks with metadata such as markers, titles, artists, loudspeaker configurations, and edited-master identification. It allows for stereo, multi-channel, and 5.1/6-channel sound layouts, depending on the mastering requirements for SACD production.

The audio encoding uses pulse-density modulation at a very high sample rate: 2.8224 MHz (that is, 64 times the standard CD sampling rate of 44.1 kHz). Each sample is one bit deep, signaling the relative instantaneous audio level through a high rate of single-bit values. The format places strong emphasis on preserving the native DSD stream without converting to PCM.

Internally the file begins with an ASCII identifier "FRM8" at offset 0 and includes chunks like "DSDFVER", "PROP", "SNDFS", "CHNL", "LFT", and "RGTC" at fixed offsets.

Dive File Format - RenderWare

These files store 3D model data in a structured binary format developed for the RenderWare graphics engine. Each file encodes model geometry, material assignments, and scene information in a hierarchy of data sections (chunks). A core RenderWare tool or game engine module that uses version-3.x of RenderWare writes these files. They are useful for rendering game objects, characters, props, or environment assets that need frame hierarchies and materials laid out for GPU or engine use.

These files are created by the exporter tools bundled with the RenderWare engine or by game asset pipelines that export RenderWare streams. After creation, the model data is loaded by the engine's stream reader (e.g. RpClumpStreamRead) which parses the file into a structure of clumps, geometry, frames, materials, and optional extensions like skinning or custom effects. Texture images referenced by the model are not embedded but stored in separate texture dictionary files. Once the data is parsed and loaded into memory, instances of the models are created for rendering in game.

Each file begins with a root section whose header contains three 32-bit little-endian values: a section type ID, the size of its payload excluding the header, and a library ID stamp encoding the engine version. Sections are arranged recursively: container sections (like Clump, FrameList, GeometryList) contain child sections; leaf sections contain binary data. Known section types include Clump (root), FrameList, GeometryList, Atomic, and MaterialList. Some files start with an extra root section for UV animation dictionaries before the Clump section. Recognisable byte signatures include ASCII markers like "pmlc" at offset 0 and "trts" at offset 8, plus strings such as "LMRF", "LTAM", "MOEG", "TSLM" somewhere in the file.

Dune Firmware File

Dune Firmware File holds the firmware image used by Dune HD set-top box (STB) devices. It is produced by Dune HD and used when updating (flashing) or restoring the software on supported models. These firmware files are signed and secured to support secure boot and ensure the file matches the target device model.

Custom firmware images in this format may include modifications such as a vendor's boot logo, altered filesystem components, or support for particular customer IDs. These custom images are built using Dune HD's firmware build service (DFB), which takes a base firmware image, optional file systems (e.g. tango.cramfs), boot logo bitmaps, and customer-specific parameters to produce a final signed firmware file. The same format is used for recovery via USB: when placed in the root directory of a USB drive and renamed to a fixed name, the device detects it at power-on and performs firmware recovery.

Data inside begins with an ASCII header signature at offset zero containing a fixed string identifying the format ("DUNEFIRMWAREFILE").

RenderWare 3D Graphics Model

Files that contain the .dff file extension are commonly used for 3D model files that have been saved in the RenderWare binary stream file format. RenderWare is a game engine created by Criterion Software, and the DFF file format is used by several games using this game engine, one of them being Grand Theft Auto.

Various apps that use files with this extension

These apps are known to open certain types of DFF files. Remember, different programs may use DFF 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 DFF file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.