assoc and ftype do not work under Powershell

Oh, they'll work, but you have to call them through cmd.exe as they're not actual programs that reside on disk, but functionality built-in to cmd.exe like so:

cmd /c assoc
cmd /c ftype

Expanding on Eric's answer, here's how to make assoc and ftype "just work" in powershell.

Add this to your powershell profile -- you can just run $Profile in powershell to find your profile file:

function assoc { cmd /c assoc $args }
function ftype { cmd /c ftype $args }