A few solutions to this. Based on Frontpage, I assume ASP is available.
Create a dynamic ASP page, which sets headers, fonts, and such like before loading the text file. In between the set of format tags and the termination tags, add a statement "" to include that file.
Alternatively you could look up what I call "Dynamic Include"
Clicky for more info.
Just a few ideas, lookup "include asp" in google for more info.
Upon the page loading, it will dynamically insert the current contents of the text file, so the text file can be updated and the web page will never even have to be modified.