As to why Notepad++ removed TextFX from 64-bit builds: the project has been dead for 9 years, and currently there is no one maintain it. Original source code for version 0.25 (dated 2008) can be fround from https://sourceforge.net/projects/npp-plugins/files/TextFX/. That code can be made to build on modern Visual Studio and it supports Unicode, but 64-bit build is impossible.