Aupad
Notepad written in AutoIt
... AuPad.
Also, the install puts the RESH.au3 (all thanks to Beege) UDF into your include folder for you.
Included in the .zip: Install.exe, Install.au3, AuPad.au3, AuPad.exe,
aupad.ico, uninstall.au3, Uninstall.exe, and RESH.au3.