Cubase to Logic

I think you can only open audio files. I don't use Cubase, but if it creates its own song file format like Logic does, then I'd guess no you can't open them. But you can export each track as an audio file and import those into Logic. If Cubase keeps its audio files in a folder you can access, you might be able to directly import them from there, but if it is like Logic, there may be a ton of little files in there that you'd have to put back together just to get a single track back. So, I'd probably go for exporting/importing instead.
There may be more that I am not aware of to this, and if so, perhaps someone else with Cubase experience will chime in.

No you really can not open Cubase files with Logic 🙂 It is not like opening .txt files with Word.

you have to export your Cubase sessions as OMF files (choose to pack the audio files within OMF...) . First you have to export MIDI files which sometimes is not perfect- that is why I am telling you to do it first (OMF does not handle MIDI files anyway...). Than try to import the MIDI files to new clean Logic Project (do not forget to set the desired tempo first-it is better to do it before importing that is my experience). Than after you will find you have your MIDI files succesfuly imported you can continue with OMF file.... But be aware that you should prepare your Logic Enviroment first for the ammount of track from Cubase. It is always better to prepare things first than to wait what happens. (trying to import a lot of Cubase tracks while you do not have created the Audio Track objects in enviroment should cause problems).
I transfered all my projects from Cubase to Logic a year ago this way and I am totally satisfied. Logic rocks!

You need Loobase