Cannot view local structures imported via direct network mount (e.g. cifs/samba, onedrive, etc)

This affect 2.8 onwards (and probably earlier).

1. On a Windows 7 PC with a samba-mounted home directory, drag a local PDB file from the home directory to the Jalview desktop.
2. Right click the sequence(s) and try to view the structure via the 'cached PDB' view.

Jmol reports it couldn't load the file. Console dump below.

Jalview Version: Development Branch Build
Jalview Installation: webstart git-commit:f37ae4b [develop]
Build Date: 17 October 2016
Java version: 1.8.0_65
amd64 Windows 7 6.1
(C) 2012 Jmol Development
Jmol Version: 14.2.14_2015.06.01 2015-06-01 19:39
java.vendor: Java: Oracle Corporation
java.version: Java 1.8.0_65
os.name: Windows 7
Access: ALL
memory: 55.8/469.8
processors available: 8
useCommandThread: false

FileManager.getAtomSetCollectionFromFile(\\\\gjb-smb.lifesci.dundee.ac.uk\\jprocter\\Downloads\\c2olpB_.5.pdb)
cacheGet file:///gjb-smb.lifesci.dundee.ac.uk/jprocter/Downloads/gjb-smb.lifesci.dundee.ac.uk/jprocter/Downloads/c2olpB_.5.pdb false
cacheGet file:///gjb-smb.lifesci.dundee.ac.uk/jprocter/Downloads/gjb-smb.lifesci.dundee.ac.uk/jprocter/Downloads/c2olpB_.5.pdb false
FileManager opening 2 \\gjb-smb.lifesci.dundee.ac.uk\jprocter\Downloads\gjb-smb.lifesci.dundee.ac.uk\jprocter\Downloads\c2olpB_.5.pdb
Time for openFile(\\\\gjb-smb.lifesci.dundee.ac.uk\\jprocter\\Downloads\\c2olpB_.5.pdb): 57 ms
file ERROR: \\gjb-smb.lifesci.dundee.ac.uk\jprocter\Downloads\gjb-smb.lifesci.dundee.ac.uk\jprocter\Downloads\c2olpB_.5.pdb
java.io.FileNotFoundException: \\gjb-smb.lifesci.dundee.ac.uk\jprocter\Downloads\gjb-smb.lifesci.dundee.ac.uk\jprocter\Downloads\c2olpB_.5.pdb (The system cannot find the path specified)
eval ERROR: Eval
 pc:0
1 statements
----
Token[keyword(3/0x8101403) value="load"]
Token[keyword(7/0x49501207) value="file"]
Token[string(4/0x4) value="\\\\gjb-smb.lifesci.dundee.ac.uk\\jprocter\\Downloads\\c2olpB_.5.pdb"]

END

Timed out waiting for Jmol to load files after 20020ms