Simple Socket File Transfer 1.0

This utility will transfer a file between two computers using a TCP port of your choosing. One computer uses Passive mode and listens on a port for a connection from the other computer, which will use Active mode to connect to the first computer via its IP address. Regardless of the selection of which computer will use Passive mode and which will use Active mode, files can be sent in either direction. Partially completed transfers can be resumed, and files are automatically checked with MD5 to ensure they were received error-free. This utility is available in both ANSI and Unicode builds, and has no dependencies on any libraries beyond those included with Windows. The Unicode build supports Windows XP visual styles and Unicode file names.

Features:

Only one computer needs to be able to accept incoming TCP/IP connections; the other just needs outbound connectivity
Files can be transferred in either direction, regardless of the direction of TCP connection
Capable of operating over network address translators (NATs) using port forwarding
Partially transferred files can be resumed if the partial file matches the file being sent
Files are automatically hashed during transfer using an MD5 algorithm
Hashes on the sending and receiving sides are compared to ensure the file was transferred without errors
Supports very large files (up to about 4 petabytes; note that you must be using NTFS to have files larger than 2 GB)