import neko.io.File;
import neko.io.FileOutput;
import neko.FileSystem;

class FileUtils
{
    /** Write out a text file with correct BOM for UTF-8 encoding */
    public static function writeTextFileWithBOM(text:String,filePath:String):Void
    {
        var f:FileOutput=File.write(filePath,true);
        f.writeByte(239);
        f.writeByte(187);
        f.writeByte(191);
        f.writeString(text);
        f.close();
    }
    
}

Puts a UTF-8 Byte Order Mark (BOM) at the top of your text file to indicate that it contains UTF-8 encoded characters. Neko target only!