Does FBX export custom properties?

Basically what the title says. I tried searching the site a bit but all I could find was posts from 08 and not really sure if they are still relevant or not.

Maybe I was doing it wrong but I added some custom properties on my mesh and exported to FBX. From what i can tell, those properties should be in the FBX file with the rest of the properties for that object but I do not see them and have to add them by hand. There was a the post from '08 that said you have to add some extra lines of code to the python script to add them but I am not much of a python scripter yet and was not sure if I was either doing it wrong or did in fact have to add some code.

Or maybe there is another way?