I'm writing a scenario and I would like to add music and sound effects. How could I do that?

1. Directory being deleted then recreated: C:\Users\root\AppData\Roaming\Factorio\scenarios\factorio-island
2. Log:

0.001 2016-07-22 00:35:59; Factorio 0.13.9 (build 23372, win64, alpha)
0.001 Operating system: Windows 7 Service Pack 1
0.001 Program arguments: "C:\Program Files\Factorio\bin\x64 ...

Here is the log ending. I made one file readonly, it caused warning. Other files just been removed.

22.400 Factorio initialised
39.971 Warning FileUtil.cpp:260: C:/Users\root\AppData\Roaming\Factorio\scenarios\my_super_scenario_name\readonly_test.txt was read only, the read only flag had to be ...

I'm making a custom scenario with some lua scripts (I keep them in the same folder with blueprint.dat). But when I save the map in the Map Editor, my entire directory is being removed (only blueprint.dat left).
My OS is Windows 7 x64.