To export a file to a different directory (for example, so that you can more easily send it to your technical support engineer if you have a question about it), first select the file to be exported, and then select the File/Export... menu item.

File → Export...

In the Choose a file panel, go to the directory on your network where you would like to place a copy of the file, and specify the file name for the copy.

A whole simulation can be exported as a .zip file containing the complete structure of the simulation with all its files.