When you open a "folder" in Explorer, some of the "files" in that folder will be
in Blue because they are Compressed.
Others may be Green because they are Encrypted.
You can turn that color off if you choose, though it does serve a purpose to
have the files colored.
Tools>Folder Options>View
Scroll down near bottom and uncheck the option to show compressed or encryted
files in color.
Gord