Problems with Custom Config File on FM2016 (Mac)

Thanks so much for your help, and for reworking that file for me. Unfortunately, still no success after the renaming - have had the .PNG problem before on a windows laptop, but am working on a mac and it seems to have a lower-case .png extension. Any other thoughts?

Use TextWrangler to write your config file on Mac, i moved all my files from windows and if you try to edit them for some reason the game wont recognise them and textwrangler is the only thing i found that would open and edit the file and still make it readable.

Thanks very much for that suggestion: I tried it with TextWrangler (even writing a totally fresh file) but still no success! I'm at giving-up point on this. The strange thing is that all of the graphics files I've brought across from Windows work fine; it's just when I try to edit anything on the Mac that it instantly becomes unreadable.