Open a direct file on the hard drive from firefox (file:///)

Question

I have a small php system i created for myself. This system contains a few .doc and .docx file documents. I want to be able to open them directly from the browser and not do

Answer 1

My working code to open locally uploaded Files via Firefox (51.0) and the actual Internet Explorer (11).

$pfad = trim(strip_tags(stripslashes(urldecode($_REQUEST['pfad']))));
$datei = trim(strip_tags(stripslashes(urldecode($_REQUEST['file']))));
exec ('start c:\\WINDOWS\\system32\\explorer.exe /select /seperate /n, /e, '.str_replace('/','\\',$pfad).utf8_decode($datei));

saved as open.php

"pfad" is a path BELOW the local Webroot (in my case customer folder) while "file" is - of course - the file which I want to open.

I call it like so: ...href="open.php?pfad=&file="

where both parameters are urlencoded