Gran Turismo 2UPDATE(27/05/2017): ".." is now ignored to avoid having this name stored as a sub-folder.
UPDATE(26/06/2017): GT2.VOL from all regional releases of Disc 2 can now be completely extracted(it would previously stop at the "gtmenu" folders).
UPDATE(24/09/2017): I finally managed to eliminate a minor bug regarding how the script would handle these directories.
Here is what this post looked like before the update.UPDATE(25/09/2017): The script has been completely restructured to support both GT2.VOL and GT2.OVL(which is yet another archive consisting of gzip-compressed files), the latter which is dumped as-is because it's not possible to actually do "decompression-on-the-fly" through the script at the moment. At least you can decompress those by yourself now, provided you have WinRAR or 7zip. I've also added a few comments here and there to better explain both of these files.
UPDATE(21/11/2018): the entirety of GT2.VOL has been re-written for the sake of "cleaner code" - i recommend to back up your old gran_turismo_2.bms file and (once you're done downloading this one) rename this new one into "gran_turismo_2_new.bms" as i've found out at least one small yet impactful issue that plague this script, for now i'd recommend you to use this script on GT2.VOL files that aren't custom-made through GTVolTools.exe