I was working with external link in visual editor. I believe I found a bug.
The file i have is located at: \\server_grp\folder\file test.pdf
I added the following in to the link: file://\\server_grp\folder\file%20test.pdf
In Chrome it shows: file://server_grp\folder\file%20test.pdf
But in IE it shows: file://server_grp\folder\file%2520test.pdf
With the %2520 rather than %20 as an extra, it causes the IE not to recognize the location.
Not sure what's going on here.