Opening OSB Files

The OSB file type is primarily associated with osu!.

OSB	File extension: OSB
	File type:	script file

What is an OSB file?

OSB files mostly belong to osu!. OSB files are used to define game events. In many cases, they work as osu! storyboard scripts that list visual and audio triggers.
These files tell the game when to change sprites, play sounds, or animate backgrounds.
Key details summarized by FilExt.com:

They serve as beatmap storyboard files in osu! to design gameplay scenes.

Some OSB files work as binary files in OpenSceneGraph for simulation with OpenSimulator.

Their content can include timing, positioning, and sound data.

FilExt.com tip: Visit the pages on osu! and OpenSimulator for further info.

How can I open an OSB file?

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

Online OSB Text Viewer

Choose your .osb file to analyze

or drag and drop it here

Online File Viewer

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OSB file format:

To find out what program is needed to open OSB files, you need to determine the file format. 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. If the file extension or signature does not match the file format, errors will occur when opening or editing the file. So you need a detailed analysis of a file to find out the format and the associated program. Below is our analysis of the OSB files:

The OSB file extension is rarely used and includes various formats for various programs. The file formats most commonly found in OSB files are:

• 35% of all OSB files start with the bytes SOSB, which are crucial for this file format. These are binary files, so they do not contain words or text. OSB files are between 90 KB and 620 KB in size. The file type was developed 20 years ago and is still in use today. The following keywords are characteristic: SOSB, SOSP and ENDPSOSP. A common filename is chara_se.osb or e_onishima.osb. These files can be linked to onishima, chara and beat.
• 15% of all OSB files belong to osu! beatmap storyboard data. If you open these files in a text editor, you can view and read the content yourself. A typical file size is 980 KB. Several words can almost always be found in the files, e.g. //Background and Video events, //Storyboard Layer 0 (Background), [Events], Centre, Sprite, //Storyboard Layer 1 (Fail), //Storyboard Layer 3 (Foreground) and //Storyboard Layer 2 (Pass). Files like these have the following tags: camellia.

All other OSB files (50%) have different formats, the following 4 formats exist: OpenSG. These files are often connected to backup. Just click the "Choose your .osb file to analyze" button on this page to find out what your OSB file is.