Log2Lines, ".iso" cache: unpack_iso() can misbehave after it copies the Iso file

• Linux (Ubuntu 16.04 at least), 7-Zip [64] 9.20:
  file needs to be named *.iso, or it defaults to Cab type
• Windows, 7-Zip [32] 16.04:
  always Iso type

–

$ mv bootcdregtest.iso bootcdregtest.iso~

$ 7z l bootcdregtest.iso~