This read only variable returns the display name of your
game for the target platform in a "save-friendly" format for the
target platform. If the display name contains any characters that
are not permitted for a file name, they will be replaced
automatically with "_". The display name can be set in the Game
Options. Note that since there are no restrictions on file
names for HTML5, this string will probably be the same as that
returned by game_display_name.
var file = game_project_name + ".ini";
ini_write_real("Scores", "Highscore", score);
The above code gets the project name and uses this to open (or
create) an ini file which is then written to.