osu! skin
File type: Game file
Files with osk file extension are skin packages for the osu! rhythm game. An osk file contains a customized game skin.
The package changes the game's visual appearance and may include related sounds and other skin resources.
File type category:
Game file
Date updated: October 12, 2026
osu! is a free rhythm game for Microsoft Windows and Apple Mac OS X. The osk file extension identifies a packaged osu! skin.
An osk file contains the images and other resources that define a skin, such as interface graphics, play-field elements, and optional sounds. It may also contain configuration information used by osu! when applying the skin.
The file is used to distribute a skin as one package. osu! imports the package and makes the skin available for selection in its skin settings.
On Microsoft Windows, install osu! and open the osk file with it. osu! imports the skin and makes it available in the game's skin settings.
An archive utility may also be able to extract the package so that its individual skin resources can be inspected, but the extracted files are intended for use by osu! rather than as a standalone document.
An osk file normally does not need to be converted. It is a skin package intended for use by osu!, and there is no standard conversion to a different file format.
To modify a skin, extract the package, edit its supported resources, and repackage the files as an osu! skin. This is an editing or repackaging process rather than a conventional format conversion.
Software applications that handle other tasks involving osk files:
Microsoft Windows
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