Maybe they e-mail them to you, or maybe you copy them over via a USB stick. In any case, the files are often compressed, like in a ZIP file.
So, you dutifully double-click the file, extract it, et voila! You’ve got the files.
There’s only one problem: the extracted files’ and folders’ names are displayed in green text.
Normally, they are black.
What do green folders mean, and how do you make them go away? Read on…