Using system file-browser (like External insets) for File -> Open (LyX/Mac)

[Ronald Florence]

In LyX/Mac, the External insets use the familiar native system Finder. 
Would it be possible to use the system file browser for the File->Open 
dialog as well?  This would make the application much more Mac-like. 
(The windows-pc style browser used in the File->Open dialog is 
unfamiliar and off-putting to Mac users.)

I assume this can be done, but for an outsider the code is a tangled 
thicket.  Thanks,
--

Ronald