There are several software programs on the market that can mount a SFTP (or also a FTP) server connection as a drive. Syncplify.me Server! strictly adheres to the standards, therefore it grants a very high degree of compatibility.
One option is to use SFTP Net Drive (by Eldos). Here’s a brief tutorial on how to map a SFTP connection as a drive using it together with Syncplify.me Server!