Thanks, but I don't understand. I have connected the camera to my iMac with the USB cable, switched the camera on and I get "USB Mode, Mass Storage, Memory Card + Internal Memory, Plays by pressing the "Playback" button". All that pressing the Playback Button does is to allow me to view the last shot (and only that), plus various options like "Group burst images", "Retouch" etc. There is nowhere to choose "Open Folder to View Files" or anything like it. How do I get to that please?.
So, could you give more steps to follow to get there please?
Unfortunately, I do not have the same camera or a Mac.
The theory is that you must open PMB Portable on the camera. There should be the option to open the file for Windows or for Mac depending on your PC. If nobody else here can help, you may have to phone Sony Support or speak to your local retailer.
However, I have found this link for an older, but similar, camera: -