Where do the sound effects on OS2 come from?

Menu Selection Click by NenadSimic -- https://freesound.org/s/171697/ -- License: Creative Commons 0

Button Tick by NenadSimic -- https://freesound.org/s/268108/ -- License: Creative Commons 0

Xylophone Sweep by DANMITCH3LL -- https://freesound.org/s/232009/ -- License: Attribution 3.0

Xylophone A by DANMITCH3LL -- https://freesound.org/s/232004/ -- License: Attribution 3.0

Xylophone F by DANMITCH3LL -- https://freesound.org/s/232006/ -- License: Attribution 3.0

Acquire by Kenneth_Cooney -- https://freesound.org/s/781199/ -- License: Creative Commons 0

Success 02 by rhodesmas -- https://freesound.org/s/320652/ -- License: Attribution 3.0

Level Up 03 by rhodesmas -- https://freesound.org/s/320657/ -- License: Attribution 3.0

Win 02 by rhodesmas -- https://freesound.org/s/320775/ -- License: Attribution 3.0

Action 01 by rhodesmas -- https://freesound.org/s/320777/ -- License: Attribution 3.0

Coins Purchase 3 by rhodesmas -- https://freesound.org/s/342751/ -- License: Attribution 3.0

Coins Purchase 4 by rhodesmas -- https://freesound.org/s/342750/ -- License: Attribution 3.0

Notification 02 by rhodesmas -- https://freesound.org/s/342755/ -- License: Attribution 3.0

Success 03 by rhodesmas -- https://freesound.org/s/322930/ -- License: Attribution 3.0

Failure 01 by rhodesmas -- https://freesound.org/s/342756/ -- License: Attribution 3.0

Connected 01 by rhodesmas -- https://freesound.org/s/322897/ -- License: Attribution 3.0

Disconnected 01 by rhodesmas -- https://freesound.org/s/322895/ -- License: Attribution 3.0

intro-loading screen sound by santimeza -- https://freesound.org/s/745021/ -- License: Attribution 4.0

Blip_C_07 by cabled_mess -- https://freesound.org/s/350860/ -- License: Creative Commons 0