gistfile1.txt

// npm install recursive-readdir
var recursive = require("recursive-readdir");
var path = require('path');
var fs = require('fs');

function ignoreFunc(file, stats) {
	return !stats.isDirectory() && path.extname(file) != ".sqf";
}

var mission = "test"; // path to folder

recursive(mission, [ ignoreFunc ] ,function (err, files) {
	for (var i = files.length - 1; i >= 0; i--) {

		var file = files[i];

		var data = fs.readFileSync(file); //read existing contents into data
		var fd = fs.openSync(file, 'w+');
		var buffer = new Buffer('#define file_name "' + path.basename(file) + '"\n');

		fs.writeSync(fd, buffer, 0, buffer.length, 0); //write new data
		fs.writeSync(fd, data, 0, data.length, buffer.length); //append old data
		fs.close(fd);
	}
});