cubase 6.5.5 not running 64 bit on my os x lion

i have a mac pro 2,1 with os x lion installed. ive checked and lion is in 64 bit mode. however cubase says its still 32 bit. Ive tried reinstalling it and it keeps saying 32 bit. What am i doing wrong?

“Get Info” for the Cubase app- there’s a checkbox there that determines whether 32 or 64 bit Cubase launches.