v1.1 of plugin: This plugin does two things.
First, it overwrites
the original Windows Notepad with NotepadEx (while you're building with PE
Builder, that is) and therefore acts as the default notepad editor for all
TXT files in BartPE.
Second, it adds an "Open with Notepad" context menu entry for all items,
so you can open any file into NotepadEx by right-click, including binary
files (which I don't recommend :P). It works for me; of course, you can
change the binary to an editor of your choice, but you must rename it and
remove the INF registry entries. Because NotepadEx allows some hotkey
text pastes, you can add your own single-line entries into the INF (read
the notes in the INF for more information).
v1.1 update: fixed the double-quote entry in the registry section to deal with paths with spaces. Also added an XML (adds notepadex to Programs > Accessories).
NotepadEx site (Full plugin, no other downloads needed.)