Network protocol WNET (a.k.a. Named Pipes, a.k.a. NetBEUI) previously supported on Windows platform is removed in Firebird 5.0.Those Windows users who operated with any WNET connection string (\\server\dbname or wnet://server/dbname) should switch to INET (TCP) protocol instead (connection string server:dbname, server/port:dbname, inet://server/dbname, or inet://server:port/dbname).

Command-line utility QLI is removed in Firebird 5.0, in accordance with its deprecation announcement published in the Firebird 4.0 release notes.

API import library for Embarcadero (former Borland) compilers fbclient_bor.lib is no longer distributed in Firebird 5.0 packages for Windows x86 platform. Anyone affected by this change may generate it using the implib.exe utility supplied with Embarcadero (former Borland) development tools as documented here.