Hey there, @Kramer7, welcome to our Community!
Is it safe to assume that you're using our desktop app, in order to open these files?
You should be able to store package files using our desktop app, but it's helpful to keep these things in mind as well.
As for editing, you'd need to have the necessary program on your device, in order to do that.
In any case, if you come across any issues, don't hesitate to let me know more!