An elevated instance does succeed on the same file.Overwrite with zeros failed on this file:
...
Error: Access is denied.
I'm guessing that getting sufficiently close to the HD "metal" should require elevation, but it's rather awkward to have to elevate every time to use Wipe.
Edited to add: Directory Opus's Secure Wipe command as well as xplorer2's Shred command, do not require elevation.
XYplorer 10.30.0005 / Windows 7 x64 SP1.
XYplorer Beta Club