I didn’t think anything of it until one of my co-workers attempted to open some of the files (the zip was downloaded to a network drive) and was unable to do so.
A quite bit of investigation showed that those folders had for some reason been encrypted when they were extracted.
- Right click on the ‘green’ folder
- Select Properties
- In the folder properties dialog box, click Advanced…
- Uncheck the Encrypt contents to secure data option
- In the Confirm Attribute Changes dialog, select Apple changes to this folder, subfolders and files