how can i see the .bullet file format

[Sky10086]

I want edit some physics effects in maya, like rigid/cloth etc. then export the .bullet file ,and i read the .bullet file to create the same physics effect in my own 3D render engine. but when i find the document about the .bullet file, from this link:https://pybullet.org/mediawiki-1.5.8/index.php/Bullet_binary_serialization,it is not work , it sees " The requested URL was not found on this server." so where to see this ?