Replace the png Base64 image in 70 ObjLibrary.js, under startup folder, (Moi4 beta).

https://jsfiddle.net/casiano/xadvz/
As a test, I replaced the icon with the red bus with blue windows, by copying the base64 code, in Moi4 beta. :-)
(The gif code seemed to work ok as png...)

- Brian

(EDIT Michael 4/13/2024 - removed broken link)