Ah well, somethings weren't meant to be I guess
Are you trying to download off a camera? Or is it the setup where you can take the chip out of the camera and slide the chip right into the pc?
I assume you know that some files are not opened by all programs.. If you see the file on your pc listed ,try RIGHT clicking it and use different programs to view it when you are given the option of OPEN WITH..
I am on an old PC and don't use Apple so we may not have similar equipment or software
You may very well be much more informed on all things computer as well as I am really closer to being a NEWB than pro at these things ! hahahah