After hours of searching, I have finally realized the only way to convert a .psu file (PS2 save) to a .psv (PS3 virtual memory card) to be able to play your old PS2 saves on your PS3 is by using the memory card adaptor.
Unfortunately, my PS2 broke, but I was able to back up my Final Fantasy X save onto my computer. I really want to continue where I left off, but I have no memory card adaptor, and I'm not allowed to buy anything for myself (teenager living with parents).
Could someone be so kind as to convert this save into .psv? I would not want to go through endless hours of grinding again.