What is an OSK file?
An OSK file is a layout or skin file used by the rhythm game osu! where players use mouse, keyboard in sync with music. It contains the layout of the editor interface and can be customized by the players to suit their preferences. osu! stores beatmap data in OSZ file format.
MIME Type of OSK File Format: x-osu-skin-archive
You can open OSK file with osu!.
OSK File Format
OSK files are saved to disc as ZIP compressed files. You can simply remain a .osk file to .zip and extract the archive to view its contents. The extracted contents need to be placed in \Skins\ directory to be loaded in the game.
Key Characteristics of OSK Files
| Characteristic | Description |
|---|---|
| File Extension | .osk |
| Primary Variants | osu! Skin files (standard format), osu! Skin Folders (extracted format), and osu! Legacy Skins (older format variants) |
| Format Type | Archive format containing a collection of PNG images, WAV sound files, and a plain text skin.ini configuration file; can be opened as a ZIP archive by renaming to .zip extension |
| Primary Use | Customizing the visual appearance and audio feedback of the osu! rhythm game; allows players to change cursor styles, hit circle designs, slider styles, spinner appearances, interface colors, and hitsounds |
| Main Feature | Single-package deployment of complete game skins; separates skin settings for different difficulty levels within the same beatmap; supports extensive customization through the skin.ini configuration file |
| Security Profile | Safe for game use; contains no executable code; not intended for manual editing but can be modified by extracting the contents; standard ZIP compression makes it accessible for viewing |
| Compatibility | Native to osu! game client (Windows, macOS, Linux); can be opened by any archive utility (7-Zip, WinRAR, WinZip) after renaming to .zip extension; requires osu! to use the skin in-game |
How to Open and Install OSK Files
Installing in osu!
There are two primary ways to open and install OSK files:
Method 1: Double-Click Installation
Double-click on the .osk file
The game will automatically detect the file and begin the installation process
Method 2: In-Game Import
Open osu!
Go to the options menu and open the “Skin” section
Click on the “Import Skin” option
Select the OSK file
What can be customized with OSK file?
The following game elements can be customized with .osk file.
- Hit circles
- Score display
- Slider type
- Cursor
- Hit bursts
Frequently Asked Questions (FAQ)
Q1: What does OSK stand for in osu!?
A1: OSK stands for osu! Skin, which is the skin package format used to customize the visual appearance of the osu! game client .
Q2: How do I install an OSK file?
A2: Simply double-click the .osk file and osu! will automatically install it, or open the game, go to Options > Skin > Import Skin, and select the file .
Q3: Can I open an OSK file without osu!?
A3: Yes, you can rename the .osk file to .zip and open it with any archive utility like 7-Zip or WinRAR to view and extract its contents .
Q4: What files are inside an OSK skin package?
A4: An OSK file contains PNG images for visual elements, WAV audio files for hitsounds, and a skin.ini configuration file that defines all skin settings .
Q5: Can I create my own OSK skin?
A5: Yes, you can create custom skins by editing images and sound files, writing a skin.ini configuration file, and packaging the contents into an OSK file .
