disapearing render images

i’m useing blender 2.48. none of my render images are saveing. i told it to save the rendered picture in the tmp folder but they weren’t there. so i changed to another folder and tried again but again they weren’t there. i have no idea why it is doing this. can anyone help?
i tryed pressing f3 but insted of saveing the image it’s saveing the actual .bend file.
P.S. sorry about any spelling mistakes. i’m not to good with spelling

To save a rendered image press F3

thank you. i’m still learning the basics.