[texhax] MS Word & Mathtype to TeX

[Barbara Beeton]

    However:

    % pdftex latexdemo.tex 

for latex, you need to use  pdflatex .

    This is pdfTeX, Version 3.1415926-2.3-1.40.12 (TeX Live 2011)
     [...]

    I have only used latex previously so maybe this file is not compatible
    [...]

this file has a name that implies that it's
latex, but  pdftex  is "plain tex", not
latex, so indeed it isn't compatible.
						-- bb