scripting ms word-- type classes?

does anyone know how what the type classes are for documents in ms word.

ex. tell application “microsoft word”
save window 1 as [type class]
end tell

in particular i’m looking to save as .txt

thanks

ps- it doesnt say in the dictionary- or at least not that i could find

Personally, to script word, I like hit-record, record-your-actions, hit-stop.
Theorically “type class” should be “TEXT” or "RTF " or “W8BN” or whatever is the file type you wish save in your doc; but I’ve been checking this and seems it’s broken.