Well, I don't know if I'm doing something wrong with Option 1 but can't access the files on the created jar; I've tested all the ways: maybe I've missed on step
1) Creating a Files folder and copying the contents of the desired resources on it:
Files
|______mp3
|______test1.mp3
2) Zipping this Folder: Files.zip
3) Renaming to, for ex: mp3.jar
4) Adding #AdditionalJar: mp3
5)
Log("File exists= " & File.Exists(File.DirAssets, "mp3/test1.mp3"))
returns File exists= False ---
P.D: Seems that it File.exists can't be used with DirAssets folder.
6) Loading the resource directly to mediaplayer
Dim mp as Mediaplayer
mp.Initialize("mp", File.GetUri(File.DirAssets, "mp3/test.mp3"))
works !