in windows XP, it's pretty annoying when a filetype is registered such as poop.gif and you can't rename it to fuck.shit
because it wants to keep the .gif filename so your change would be fuck.shit.gif
the way I usualy get around this is switching to a dos prompt and making my way to the directory the filename is in and use the ren command.
is there a way to tell windows to let me worry about filename extensions?