How to display an API populated virtual folder in Windows Common File Dialogs

We have a REST API that we can use to get a list of files, upload and download files. Now we need to integrate this API in one of our application so that users can open and save files using the API.
I want to make the UI consistent with opening and saving a normal file. Instead of creating new dialogs, I believe the Common File Dialogs can be tweaked to display a virtual folder populated using the API. A new location can be added on the list on the left hand side. Any ideas how this can be accomplished?

via Chebli Mohamed