Feature Request Built in file browser

Simply put it'd be nice to have a built in method for opening a file browser in unity on Windows, Mac and Linux. It would ideally support:

- Skins (or just a way to open the local file explorer open dialog on any Windows, Mac and Linux),
- Loading files into a bytes[] array or copying them into AppData memory somewhere (or some other method of interpreting the data - maybe returning the file as the choresponding type in unity - i.e mp3, wav or ogg would return an audioclip),
- Browsing of files across multiple disks, renaming of files and creating new folders (if the option is enabled)
- Selection of file types to include and exclude

 

And whilst yes there are brilliant options available on the asset store, github and websites they are limited by thier cross-platform capabilities