Apart from this file, I have the main folder "Contents". If I can't use an executable file, where do I place the driver folder to enable it to be used by applications?
Where did you get the drivers from? It sounds like they were packaged incorrectly.
You seem to have an application without it's wrapper folder. On OSX most apps are really folders with a .app extension. The Finder knows to display these as apps.
The structure is
<app>.app
Contents
MacOS
<app> <-- This is a Unix executable
Resources
files...
There can be more folders in Contents than that. Perhaps if you drop Contents in an appropriatly named folder it will work?