Thank you for your inquiry.
To load your files from another web server and then view them, you can use two ways.
First way: to view the file you can set url for direct access to the file in the GET parameters of the Viewer for Java library for example: http://127.0.0.1:8080/view?file=url_to_file and then our viewer will download it and show.
Second way: create your CustomInputDataHandler class to build a tree of your files from remote server and then view them. In our samples we have provided an example for how to use such way , but for best understanding this way you can investigate our article here.
If you will have more questions please feel free to contact us.
Can you please provide or point me to an example on how to do that using the .NET Viewer?