The server you are describing I have never seen... even in the 90s. I have never seen a server where .htaccess was disabled AND you couldn't go one level up from www/public_html/htdocs/etc.
So now curiosity has gotten the best of me... is this a private lan or something? The only thing I can think of it is one of those situations where a University gives you a website but it is really really locked down.
Also, try starting it with a dot (".mytest.html") as a lot of servers prevent hosting up files that start with a dot.
