As an update - the folder appearing in that location at all was a bug with the original implementation of the logging. Here are the two folders that can be safely deleted if you run into them, by default:
C:\Program Files(x86)\Worl <- Delete the Worl folder
C:\Progra <- Delete the Progra Folder
The bug hasn’t quite been fixed yet, but in a future build of the client, they’ll be located here instead:
(Your WoW Install path)\_retail_\Logs\Checkout.log