Save files to disk for later use by application

Hi, guys!
Sorry to ask you this, but, after researching the topic, I still haven't gotten anywhere. And I'm new at Visual Studio C++/CLI, too!.
I'm using two types of data files in my application:
a) arrays (to be used in comboboxes as menu items), and
b) structures (to hold the data users will be accessing).

I want to save them all to disk, so they'll be ready for the program when it starts, instead of creating them everytime.

I'd be grateful if you helped me with this, specially on how to:

1. Find out if the file already exists
2. Save the file to disk, after creating it
3. Open it for use within the application.

Thanks in advance.

Tags: C++/CLI