Select files in list view, use Ctrl button with mouse click to select
more then one file. If you want to select all files click select all in the menu
[File], or click button select All ()
on the tool bar. If you need unselect all files, click unselect all in the menu
[File], or click button unselect All ()
on the tool bar.
Step 2:
Set attributes (Read-only - grey, Archive - unset, Hidden - grey, System - grey), set them, like on the picture:
Step 3:
Click menu [File] change file attributes, or click change file attribute
button ()
on the tool bar.