
Originally Posted by
Zerosion
Instead of doing this you can just rename the FINAL FANTASY XIV-A Realm Reborn.themepack to FINAL FANTASY XIV-A Realm Reborn.rar and extract them with Winrar. 7zip works too. And I imagine any other program that can extract files.
Did you miss that my instructions were for Mac users? If not, boring Mac-relevant details follow. 
I was a little shocked that there actually is a version of "WinRAR" that runs on Macs. However it's a unix command-line executable, which isn't nearly as simple to use as drag-and-drop with no rename. I didn't try 7zip for Mac because it requires the extra step of downloading it via BitTorrent, and that's already more complicated than the one download I suggested.
The theme file is actually a Microsoft .cab file. Many Windows file extractor utilities will unarchive them, but pure .rar ones don't (like UnRarX on Mac: "not a RAR archive"). "The Unarchiver" does, and also doesn't choke on the kanji in the sound filename.