This is useful for playing ANY of the game's stock campaign or training missions as REGULAR SINGLE missions, and the edited mission titles will force them to be GROUPED TOGETHER and listed alphabetically with a prefix of "Campaign - " or "Training - " in the "Single Mission" selection screen/menu within the game.
To install, simply unzip the files located in the "Missions" directory of the ZIP archive to the "Missions" subdirectory on your hard drive. None of the stock original mission files that are used for the campaigns will be overwritten (as the campaign mission files are located in the "Campaigns" subdirectory on your hard drive).