FTPDrive
FTP Drive is an installable file system and network redirector for NT-based Microsoft Windows operating systems. This program is a File Transfer Protocol (FTP) client whose functionality can be accessed from any file manager in an OS. FTP servers have to be configured in a special applet and appear in Windows explorer (or any other file manager) as subdirectories of a (virtual) network drive (the drive letter also can be configured). As of October 28, 2007, this program is freeware.
Read-only file access can be completely transparent to applications, as long as they do not use very large memory-mapped files. Random write access is not possible due to limitations of the protocol. It is possible to copy files to a server, and programs which write files sequentially, as one operation, should not have problems with write access. This program has some support for FTP over SSL and TLS.