I believe this page has a well worded answer to your question:
https://stackoverflow.com/questions/18246053/how-can-i-create-a-link-to-a-local-file-on-a-locally-run-web-page/18246357

Brian Cluff

On 5/8/20 11:14 PM, Joe Lowder via PLUG-discuss wrote:
> How can I get the simple html menu
> (example code shown below) work to view mp4 videos
> from a menu link on my local computer in the same
> way that I can view jpg images (and when all the
> same files are uploaded as at this link:
>
> https://upquick.com/viewpix/
>
>
> Below is the simple code example:
>
> Click to view each image:<p>
>
> <li><a href=the-end.jpg>the end</a>
> <li><a href=todolist.jpg>todo list</a>
> <li><a href=together.jpg>together</a>
> <li><a href=toiletpaper.jpg>toilet paper</a>
> <li><a href=tpweddingdress.jpg>TP wedding dress</a>
> <li><a href=turkey-bacon.jpg>Turkey Bacon</a>
> <p>
> But none of the examples below work on my computer. Why?
> <li><a href="splash.mp4">Splash 1</a>
> <li><a href="file:///splash.mp4">Splash 2</a>
> <li><a href="vlc splash.mp4">On the command line this works: vlc
> splash.mp4 </a>
> <p>
> What would be the simplest code to be able to<br>
> just click on a menu link to view an mp4 video?
>
>
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