I have recently purchased both Neverwinter Nights and Neverwinter Nights 2 from GOG. I downloaded the GOG Downloader and downloaded the games via the Downloader. However, when looking at my downloads, both of the games appear as folders with files that i cannot open in them. How do I play these games on a Mac?

I am currently using Mac OS X 1.6.8 and am using a 2008 desktop iMac.

That's because GOG doesn't sell Mac versions of these games, only Windows.
Try this to play them on your Mac - http://www.playonmac.com/en/
You can also look here - http://paulthetall.com/neverwinter-nights-mac/

Not sure, but you can ask support - http://www.gog.com/support/contact

i sent a message

Playonmac works for NWN 1 but for NWN2 something isn't right. I'll retry the installation and see what happens.

Again, thank you so much for your help!