See PHI920. Ref T13210. Since the HTML is just:
<a>View Inline</a><span>filename.txt</span>
..double-clicking "filename.txt" in email selects "Inlinefilename.txt".
Add a space to stop this. At least in Safari, a space between the tags is not sufficient (perhaps because the parent is a <div>?). I couldn't find an authoritative-seeming source on what the rules for this actually are and adding a space here fixes the issue without changing the visual rendering, so just put it here.
