Robocopy Fails on Windows Cluster Shared Volumes (CSV)

Using Windows 7 client, or Windows server 2012 r2 Hyper-V console on a cluster node, robocopy fails to copy files from a CSV to a client share.

Either using Windows Explorer or XCopy works, however XCopy failed on files over 2GB... So lets go old school for the VXD copy.

H:\>robocopy \\clusternode.com.au\c$\ClusterStorage\Volume1\dave.txt D:\

  Started : Thu Aug 30 11:16:48 2016

   Source : \\clusternode.com.au\c$\ClusterStorage\Volume1\dave.txt\

    Dest : D:\

    Files : *.*

  Options : *.* /COPY:DAT /R:1 /W:1

------------------------------------------------------------------------------

2016/08/30 11:16:48 ERROR 267 (0x0000010B) Accessing Source Directory \\clusternode.com.au\c$\ClusterStorage\Volume1\dave.txt\

The directory name is invalid.

H:\>robocopy w:\dave.txt D:\

  Started : Thu Aug 30 11:17:10 2016

  Source = w:\dave.txt\

  Dest : D:\

  Files : *.*

  Options : *.* /COPY:DAT /R:1 /W:30

------------------------------------------------------------------------------

2016/08/30 11:17:10 ERROR 267 (0x0000010B) Accessing Source Directory w:\dave.txt\

The directory name is invalid.

H:\>xcopy w:\dave.txt D:\

W:\dave.txt

1 File(s) copied

No fix, sorry, just a problem.