Windows 3.x/3.11.300

Windows for Workgroups 3.11 build 300 is the official RTM build of Windows for Workgroups 3.11. It adds a 386-protected mode networking stack, and includes support for NetBEUI and IPX protocols, numerous network cards, a client for accessing remote printers and file shares, and a print and file server. TCP/IP is available as a separate add-on. The use of protected mode networking software frees up more of the conventional 640k memory for DOS programs and simplifies configuration.

It is sometimes referred to as build 412.