No, you misunderstood and I have been lazy with the explanation.
To find your track's .gp4 file (in your case melborne2001.gp4) do as follows:
1) Get the appropriate track's .wad file (in your case melborne2001.wad) from the main GP4 directory. I always copy it to my eventual folder I use to store the files associated with the new track.
2) Unpack it with e. g. WadUpdater.
3) The unpacked folder will be called xxx2001, in your case melborne2001. This folder will contain three subfolders called 'fonts', 'maps' and 'samples'. Under 'maps' you find 'resources' and xxx2001, in your case 'melborne2001'. In the latter, you will find the necessary .gp4 file, the .bins, the .col, etc.