gulp.dest('....', { mode: '0444' }) does not affect files on windows?

[AnderssonPeter]

Hi I'm trying to mark all files as readonly but it does not seem to work on windows?
Only the directories are marked as readonly?

const copy = () => 
    gulp.src(['./legacy-app/**/*'])
        .pipe(gulp.dest('./src/legacy-app', { mode: '0444' }));