Sage 50c - OneDrive for Integration?

Does anyone know if you can access Sage 50c data stored in OneDrive from outside of the Sage product itself?  In short, is it viable to go straight to Sage data in the cloud rather than use an API to access data via a local installation?  I note there are a couple of Office 365 apps in the store that provide reporting functionality which indicates there are some ways of getting data directly...but does this have to all be done within Office 365 or could we use Graph API calls from a windows application to access the data (with all authentication and authorisation steps assumed).