Thanks, but that's the problem.
Host wants the Install Folder/Path to Slic3r and I can do that. But it also wants the config file for Slic3r and as mentioned above, Slic3r puts that in /home/user-name/.config
Host has no way of showing any "dot" Files or Folders that I can find.
The File dialogs seem to be totally windows-oriented. On that subject, Host makes it very difficult to navigate to a USB drive (block-device) in Linux.
p.s. Not a newbie with Linux, very comfortable at the CLI with "ls" et al.