EmEditor

EmEditor is a lightweight extensible commercial text editor for Microsoft Windows. It was developed by Yutaka Emura of Emurasoft, Inc. EmEditor includes full Unicode support, 32-bit and 64-bit builds, syntax highlighting, find and replace with regular expressions, vertical selection editing, editing of large files (up to 248 GB or 2.1 billion lines), and is extensible via plugins and scripts.
Features
Unicode support
EmEditor supports Unicode and provides tools for work with various character encodings. These features include automatic encoding detection, byte order mark support, file reload with a different encoding, and detection of encoding errors. EmEditor can use any encoding supported by Windows and easily converts from one encoding to another. The program opens Unicode file names and searches for Unicode characters.
Large files
EmEditor is capable of supporting very large file sizes without losing functionality....