TextMorph
"TextMorph... is also a text editor, similar to Notepad....TextMorph has a number of "tools" that you can apply to the text, such as converting from text to HTML and vice versa, cleaning up emails (removing all those ">" signs and so forth), search and replace by words OR multiple paragraphs, changing upper/lower case, etc."....
"What's more is it can also repetitively do these tasks across large numbers of files (using TextMorph's Multiple File Morph wizard). For instance, if you have 500 text files, you can in less than a minute, convert all 500 of them to HTML files complete with all of the formatting that you wish in the files (such as background image, etc.)"....
"TextMorph should run on all 32-bit Windows platforms and is easy to install and uninstall. It has been thoroughly tested on Windows 95B and Windows XP. "....