I have a HTML file in my site with a sample code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<HTML>
<HEAD>This is a test for internal files </HEAD>
<BODY>
<A href="file:///networkpath/folderName/File Name.pdf" target=_blank>click here</A>
</BODY>
</HTML>
I tried all possible combination of slashes (forward/backward) but nothing seems to work in IE and FF. The link is dead, no action at all.
When I save the same file in my local machine it work fine. Same file When I copied to a internet site it didn’t work.
This is by design. All modern browsers prevent linking to local resources for security reasons.
See this answer for details.