On the Mac, there is no way to show hidden files in the FileBrowserComponent. Adding a simple setIgnoresHiddenFiles(bool), which passes the choice on to its fileList member, would fix this easily. Adding that as a possible flag on instantiation would also be a nice addition.
(For Windows&Linux, command+H toggles this, but that hides windows on the Mac, and no other solution was implemented for Mac. Plus, users would have to know to do that.)