To enable hidden files/folders in finder windows:

1. Open Finder
2. Open the Utilities folder
3. Open a terminal window
4. Copy and paste the following line in:

defaults write com.apple.Finder AppleShowAllFiles YES

6. Now hold ‘alt’ on the keyboard and right click on the Finder icon

7. Click on Relaunch

You should find you will now be able to see any hidden files or folders. One you are done, perform the steps above however, replace the terminal command in step 4 with:

defaults write com.apple.Finder AppleShowAllFiles NO