Converting web-based application to win32 app

We have a browser-based application that we would like to make a duplicate version of for win32.

Now the only snag here is that all data resides on the server. As well as any email attachments/files the users have.

Now we would like to keep all user email attachments/files on the server. So in a Windows 32 application, is it possible to have some sort of HTML browser embedded page in our app so that specific part of our software will act like the web browser?

Also, how would a file upload work? Or could we make some sort of provision so the user is already logged into the server and can copy files to a restricted folder?

Or how would you recommend this be done?

Thanks
Greg