many ftp servers do not recognize .htaccess, nor do they allow you to edit them. so basically you cant do it unless you telnet/ssh into your box then u cna edit all you want. in this case windows is better since most of the ftp servers will let u do whatever you want with a file as long as it has a .something in the file name.
~~:M A G n U m:~~
(Disclaimer: if any of this info is confusing or vague tough, its free!!)