What methods available to load a local intranet file from a website request?

I’ve a HTTPS website that my customers use (built in MVC .Net). I want to be able to load files hosted on the clients intranet. I have the full local paths to all the relevant files on the clients on their local infrastructure.

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Above works when everything is local but when I do it remotely it wont work due to browser security issues .i.e. they rightfully dont allow this as they run in their own sandbox etc…

So I’m unsure what options are available to me to get this to work. If required my customers would allow me to install some serviceapplication on local PCs to get this to work – but I’m unsure of what to use. I’ve seen discussions about installing a small HTTP server on the client to deal with this (Nancy ???) – is this the way forward or is there something else I can use. If possible the solutions should be browser agnostic.

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