DCF File

What are DCF files and how to open them

Are you having problems opening a DCF 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 DCF files.

What is a DCF file?

DCF files have multiple uses, and DRM Content Format is one of them. Read more about the other uses further down the page.

DRM Content Format File

DCF files are media files that have been encoded with Digital Rights Management copy protection technology. Cell phones often use this technology to save ringtones, videos, pictures, and other playable media that have been copy-protected. Nokia was one of the first cell phone companies to use the DCF file format.

The DCF file format is similar to the DM file format. However, with the DCF file format, the rights object is located in a separate file, not within the DCF file itself.

How to open DCF files

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

Last updated: October 22, 2026

All known file formats using extension .DCF

While DRM Content Format File is a popular type of DCF-file, we know of 7 different uses of the .DCF file extension. Different software may use files with the same extension for different types of data.

D-LIB Bytecode File

We know that one DCF format is D-LIB Bytecode File. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Daintree SNA Capture File

The Daintree SNA Capture File is a plain-text log format produced by the Sensor Network Analyzer (SNA) software. It records radio packets captured from IEEE 802.15.4 and ZigBee networks, along with timing, sequencing, signal quality, and other metadata, for later inspection or replay.

This format is written by Daintree Networks' SNA when connected to compatible capture hardware (e.g. the 2400E Sensor Network Adapter, or other supported adapter boards), or when it replays previously captured traffic. The file is used both during live capture sessions and for post-analysis to decode protocol layers, visualise network topology, or troubleshoot wireless communications.

Capture records appear one per line, with fields separated by spaces. Each record includes a sequence number, timestamp (seconds and microseconds since the Unix epoch), packet data in hexadecimal form, length fields, and signal-related measurements such as RSSI. The first line of the file may begin with a line such as "#Format=type", where type identifies the version of the format used; if this line is missing, format version 1 is assumed.

Files are identified internally by a header signature at the very beginning of the file: the ASCII text "#Format=4" at offset 0 for format type 4. They also contain strings like "SNA V" in metadata lines that indicate software version.

DCF Images Container

We know that one DCF format is DCF Images Container. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Driver Cleaner Customization Filter

We know that one DCF format is Driver Cleaner Customization Filter. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Dyalog APL Component File

A component file is a specialized data file used by Dyalog APL to store a collection of APL arrays called components. It lets a program save many separate arrays in a single file so that each one can be accessed by a component number. It is capable of handling nested arrays, numeric or character data, and supports dropping, replacing or appending components.

The file is both created and used within the Dyalog APL system. It is written using system functions like Create, Append, Replace, Drop and Read, and can be tied exclusively or shared among multiple APL processes. Multi-user access, locking, permissions and file size limits are built in. When shared across versions or platforms, interoperability works for many arrays, but features like Unicode characters or objects may be restricted.

Files begin with a binary identifier: at offset zero the two-byte sequence 0xAA 0x01 signifies a Dyalog APL component file.

Qt Assistant Content File

The Qt Assistant Content File format is an XML-based description used by the Qt framework to register custom documentation within Qt Assistant. It defines what content should appear in the help system: table of contents hierarchy, searchable keywords, the title, optional images, an optional icon, and other metadata that helps users navigate documentation through Qt Assistant.

These content files are written by documentation authors, usually alongside their HTML documentation. Qt Assistant reads them when launching with the -addContentFile option or when users add or remove documentation via its preferences. They allow multiple content descriptions in a single file (tagged with <assistantconfig>), introduced in Qt version 3.2.0, though older single-DCF files are still supported.

Internally the content file uses tags like <DCF> (or multiple of them under <assistantconfig>), <section> nested arbitrarily to build table of contents, and <keyword> tags for defining entries in the search‐index. Attributes such as ref (path to an HTML file), title (section title), icon (icon file), and imagedir (additional image directory) specify how Qt Assistant should display and locate resources. Paths in ref are relative, use forward slashes, and keyword tags must precede nested sections in each section.

A technical identifier for this format begins with an ASCII DOCTYPE declaration like <!DOCTYPE DCF> at the start of the file. Strings appearing in its content typically include "CLASS REFERENCE", "KEYWORD REF", "SECTION REF", "INDEX.HTML", "IMAGEDIR", "ICON", "TITLE", "EXAMPLES.HTML", and others that reference the structure and resources of Qt documentation.

Various apps that use files with this extension

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