Okay so that's not the issue. I looked at your first 3mf file. It's not a project file.
In cura when you save the project DO NOT DO: "file" "export". This saves a 3mf file that contains only the model.
Instead do "file" "Save project...". This saves all the settings. And also the model.
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gr5 2,234
I think I know the issue. If you open a project file it should then ask you if you want to open it as a single model or the whole project. I'm guessing it's not asking you. It should also often ask if you want to update the machine "ultimaker 3". Anyway go to menu option "preferences" "configure cura". Scroll all the way down and there is a dropdown just below "default behavior when opening a project file". Set it to "always ask". Or to "always open as project"
Answer to #3. Rename it to ".zip" instead of ".3mf". Then double click on it and the files in there are all (mostly?) text files.
If this doesn't work I would try completely erasing all the user settings on the machine that you are using to load the project files. You will lose all settings and all machine types you configured so maybe test this out on a different computer? Here's how to do that:
https://support.ultimaker.com/hc/en-us/articles/360013007080-How-can-I-completely-reset-my-Ultimaker-Cura-installation-
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