How to find the source path of a file located on my server web application?

I cant find a file's source

There's a file which I want to know from where its being downloaded and that server has disabled right click and all stuff... I even used a download manager to know from where its being downloaded but it only shows the main URL not the file path (same case in URL bar) It uses some JRAP and jQuery which I don't understand please anyone could help me out?