Shantilly

I am trying to send out a mass email to my client base in tantrack. I have read the help file, it tells me whatever file I have to send has to be a *.txt doc or an html document. I have created 2 files now , one in word and one in notebook. However, when I open up my window in tantrack to locate the file to send, neither of these files come up. Not sure what I am doing wrong.