B4J Question Imposible to open file

Where is the external file located? How is it referenced in the html file?

Is in the Files folder of the project, but I also tryed to locate it in a fixed path (c:/book/moby-dick.epub) and nothing works. Yet, if in the html I call the online version like that:
var book = ePub(url || "https://s3.amazonaws.com/moby-dick/moby-dick.epub");
instead of
var book = ePub("moby-dick.epub");
or
var book = ePub(c:/book/moby-dick.epub");
(and both of them work fine in the html version), the online version catchs the file an runs properly. So i´m guessing is an access problem to the right folder.

Project attached (the epub file itself is not included because is bigger than the allowed max file size, but it can be downloaded forn the link above or any other epub file will work).

I've tried it with the modification you made (var book = ePub(url || "https://s3.amazonaws.com/moby-dick/moby-dick.epub"). It doesn't work here.

Worth testing with a different folder. File.DirAssets folder is a virtual folder inside the jar.