endofline and msgbox

The below code should be same but the result is different.

The first is the correct behaviour. First line bold, second line not bold.

msgbox “Line one”+EndOfLine+EndOfLine+“Second Line”

This shows two bold lines.

msgbox “Line one”+EndOfLine.Macintosh+EndOfLine.Macintosh+“Second Line”

Bug or not?

They are not exactly the same.

EndOfLine when run on OS X return Chr(10)

EndOfLine.Macintosh returns Chr(13)