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FFSD File - What is an .ffsd file and how do I open it?

Learn about .FFSD files and view a list of programs that open them.

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Overview

What is an FFSD file? An FFSD file is a character file used by the Nintendo Wii U to store a Mii, a customizable avatar that appears in various Nintendo games and system applications. It contains data that defines a Mii's appearance, such as facial features, hairstyle, and colors, as well as metadata identifying the creator. FFSD files may represent both player-created Miis and official Miis distributed by Nintendo.

More Information Miis are personal avatars that appear across Nintendo's game consoles, including the Wii, 3DS, Wii U, and Switch. Each console generation uses its own file format to store Mii data, and the FFSD format is specific to the Wii U. The FFSD structure closely resembles the .CFSD format used by the Nintendo 3DS, but it includes a key difference: the fourth byte of an FFSD file is always set to 40, which identifies the file as a Wii U Mii.

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DeveloperNintendo
Popularity2.5 | 8 Votes

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.FFSD File Extension

Wii U Mii Character

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What is an FFSD file?

An FFSD file is a character file used by the Nintendo Wii U to store a Mii, a customizable avatar that appears in various Nintendo games and system applications. It contains data that defines a Mii's appearance, such as facial features, hairstyle, and colors, as well as metadata identifying the creator. FFSD files may represent both player-created Miis and official Miis distributed by Nintendo.

More Information

Miis are personal avatars that appear across Nintendo's game consoles, including the Wii, 3DS, Wii U, and Switch. Each console generation uses its own file format to store Mii data, and the FFSD format is specific to the Wii U. The FFSD structure closely resembles the .CFSD format used by the Nintendo 3DS, but it includes a key difference: the fourth byte of an FFSD file is always set to 40, which identifies the file as a Wii U Mii.

How to open an FFSD file

FFSD files are not meant to be opened. Instead, they are typically found within Wii U system data or game files, and the game automatically loads the information they store.

However, Mii enthusiasts may open or modify FFSD files with Mii Creator, a community tool that also allows users to download FFSD files. The MiiLibrary.com website also hosts collections of official and fan-made Miis saved in the FFSD format for archival and customization purposes.

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Programs that open or reference FFSD files

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Updated: November 12, 2025

FAQ

What is an FFSD file?↓
An FFSD file is a character file used by the Nintendo Wii U to store a Mii, a customizable avatar that appears in various Nintendo games and system applications. It contains data that defines a Mii's appearance, such as facial features, hairstyle, and colors, as well as metadata identifying the creator. FFSD files may represent both player-created Miis and official Miis distributed by Nintendo.
How do I open an .ffsd file?↓
FFSD files are not meant to be opened. Instead, they are typically found within Wii U system data or game files, and the game automatically loads the information they store.

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