After looking closer on FileServerHandler.cs I found
50 /// This handler handles requests for LinkClick.aspx, but only those specifc
51 /// to file serving
57 public void ProcessRequest(HttpContext context)

That mean that we probably may get a file stream in return, if user is authenticated ?

202 if (directUrl.Contains("LinkClick") || (blnForceDownload && folderMapping.FolderProviderType == "StandardFolderProvider"))
203 {
204 fileManager.WriteFileToResponse(file, contentDisposition);
205 download = true;
206 }

A JS-sample for using JS to invoke/do this would be a great.

Source:
https://github.com/dnnsoftware/Dnn.Pl...