…and how would I do that?
Before you start going on the "${PERSON} 'hacked' my computer" warpath and making an utter fool of yourself, I'd suggest reading up a little on what has been discussed.
https://en.wikipedia.org/wiki/File_URI_scheme
In particular, I call out this passage:
> File URLs are rarely used in Web pages on the public Internet, since they are only useful if it is known that a specific file exists on the designated host or the local computer. Additionally, web browsers generally disable File URLs in web pages that were not themselves loaded from a File URL for security reasons.[9]