defult elgg File plugin issue

I have seen an issue in the file plugin. if you post any image using file plugin its works fine (it means actual file show even at river and on the landing page).

But if you post any other file like flash, mp3 or video . file plugin shown you the defult image of the elgg not the actual file. Because of this user never able to see the actual file other than images.

Can you please help me in getting the path of the file which user posted? I want when user insert the other files also in the system instead of the default image actual file should come.