I'm sure everyone has their favorite text editor but if you don't and are looking for one that isn't specific to any specific OS, try Jext.
http://www.jext.org
I've been working on story window mods and this the only program that I have found that will append text at the beginning of every line, even when there is existing text. You can select the whole page, then tell it to insert <BR> at the beginning of every line. Works like a charm.
--edit
to prove the usefulness of Jext, I created a custom tag 'inserter' for it. Save the following text into a file called EQSL.insert.xml and put it into the \Documents and Settings\User Name\.jext\xinsert\ folder. (applies to Win2k and XP)
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE xinsert SYSTEM "xinsert.dtd">
<xinsert>
<menu name="EQ Story Line">
<item name="BreakLine"><br></item>
<item name="DocLink"><a href"file:///storyline/">|</a></item>
<item name="Green"><c "#00FF00">|</c></item>
<item name="Yellow"><c "#FFFF00">|</c></item>
<item name="Cyan"><c "#66CCFF">|</c></item>
<item name="Magenta"><c "#FF00FF">|</c></item>
</menu>
</xinsert>