Weird Zip Problem

[TuxInAGalaxy]

Fair enough being careful making the file publicly available via Dropbox and a link on a Forum.
Have you considered private messaging/ email as a solution to get help?

What I would do with the file:

• inspecting the file
  
• unpacking the file with the default software
  
• installing additional software like p7zip and unpacking the file with it
  

Feel free to PM me if you like.
Hope that helps

I have never used p7zip from the command line.  I'm researching it now:  https://www.youtube.com/watch?v=5jyrM0yPrrI

I found this site:  https://www.ruinelli.ch/p7zip-gui-for-linux  I wonder what is your take on it?