Using 7-Zip 4.23, I got an error whenever I tried to save an archive using a UNC pathname that contained a dash. 7-Zip would report "System Error" and "Not Implemented". Take out the dash.
... until the collector arrives ...
This "blog" is really just a scratchpad of mine. There is not much of general interest here. Most of the content is scribbled down "live" as I discover things I want to remember. I rarely go back to correct mistakes in older entries. You have been warned :)