|.osz||Executable beatmap file.|
|.osk||Executable skin file.|
|.osu||Compose, Timing, Song Setup.|
|.osr||Executable replay file (cannot be decompressed).|
.osz/.osk file is a file extension tailored specifically for osu!.exe. When opened, .osz file will be extracted by osu!.exe and transferred to "Songs" folder while .osk will be extracted and transferred to "Skins" folder. By default, beatmap files downloaded directly from the official website generally be in .osz file format. Creating a .osz/.osk file is a fundamental knowledge for beatmapping/storyboarding and skinning community respectively.
Compile your files into a folder (.mp3, .flv, .osu, SB, etc. into the folder). Name the folder.
For explanation purpose, folder will be named "Amigo Fiesta".
Right-click the folder and choose to archive the folder (Add to archive...).
You can also choose to open the File archiver software first and drag-and-drop the folder in.
Inspect the settings. Set archive method as ".zip" (not .7z, .rar) and rename the folder file extension to .osz manually in the text box.
Amigo Fiesta.zip -> Amigo Fiesta.osz, Archive method: ".zip"
Allow the archive process. An .osz file will be produced as end product along with the distinctive osu! icon for the file.
Rinse and repeat for new copy. For skinning, use .osk extension.
Like above, compile your files into a folder and name it.
Usually, if you edited the beatmap before, everything will be ready to be converted to .osz. For skins, you must compile the files before.
If you want to make a .osz, then:
If you want to make a .osk, then: