(I am a beginner) How to open simulations using the simulation folder

[OjasnRCGamer101]

I am Mac user and whenever I try to open (ex: Itacifier .ubox),  It will say:
>There is no application set to open the document “Itacifier .ubox”.Search the App Store for an application that can open this document, or choose an existing application on your computer.<

Can someone please tell the solution to this?

[fredetuc]

Try resting the computer or the laptop. If this doesn't work try calling you provider for more details. Sorry this happened but don't worry it happens to a lot of people.

[Jar]

This just means your computer doesn't know what to do with that file. Instead of opening it from Finder, open the sim files from within Universe Sandbox ².

Click Home > Open > My Sims. You should see all of your saved sim files there.