All about FD Files

The FD file type is primarily associated with UEFITool.

FD	File extension: FD
	File type:	disk image file

What is an FD file?

FD files mostly belong to UEFITool. The FD file is not tied to one single purpose. It is used in several contexts depending on the system that creates it.
For example, many FD files act as firmware disk images that store BIOS or UEFI firmware. These files include boot code and configuration data, and are used by tools in environments such as QEMU or development kits like EDK2.
They can also be created as floppy disk images with tools from Flash Develop or Flash Development Toolkit, and in some cases, they serve as asset containers in games – for example, holding font data or fastfile content in Call of Duty titles.
Other uses include specialized data storage (such as the ADBS file format used with Micro Focus systems).
The different uses mean that opening an FD file requires identifying its context.
Key uses include:

Firmware Disk Images: Used to update or emulate system firmware.

Floppy Disk Images: Employed by legacy emulation or development tools.

Game Asset Containers: Store fonts or fast access data in games like Call of Duty (Call of Duty).

Specialized Data Files: Follow proprietary formats for business or HRMS applications.

FilExt.com note: If you have an FD file, check its size and origin. Tools like UEFITool or specific emulation programs can help you inspect its contents.

How can I open an FD file?

You need a suitable software like UEFITool to open an FD 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 FD file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a FD file directly in the browser:. Just drag the file onto this browser window and drop it.

Online FD Text Viewer

Choose your .fd file to analyze

or drag and drop it here

Online File Viewer

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FD file format details:

If you can determine the file format, the associated program can also be determined. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. File extension, signature and file format must match; otherwise errors will occur when the file is opened. Knowledge is power - this also applies when dealing with unknown or faulty files. In the following you will find our evaluation of the FD files:

The FD file type is used by many programs, each with its own file format. The two most popular formats are as follows:

• 10% of all FD files are using the well-known EXE file format to store the data. EXE is the abbreviation for executable and is the standard executable file format on Windows. The format can be identified by the letters "MZ" at the beginning. Executable files can also be used to distribute viruses and other types of malicious software (malware). They consist of illegible, cryptic characters. The file size is in the range of 6 MB to 18 MB. The file name BIOS.fd is typical for these files.
• 10% of all FD files use the same file format, which have the signature 00 00 00 00 00 00 00 00. If you open these files in a text editor, you will see only illegible characters. The average file size is 540 KB with most files being between 130 KB and 3 MB in size. The keywords _FVH and ir;M are typical for these files. The file name OVMF_VARS-1024x768.fd or OVMF_CODE.fd is typical for these files. These files are often associated with ovmf, vars and code.

All other FD files (80%) have no consistent format, frequently e.g. LaTeX Font Definition and ADBS. These files are often connected to aachen, common, custom, acer or core. Just click the "Choose your .fd file to analyze" button on this page to find out what your FD file is.