I see a file named MSGLSTL.MSF in that Voice folder that's 2208 KB. What's in that? It doesn't look like any type of file I'm familiar with, so I'm thinking you probably need some Sony app to open it. Did this device come with a user guide and CD by any chance? I know some folks think reading user guides can give you leprosy, but I always tell my students it's not true!
My googling led me to learn that the .msf file is a compilation of how different files and folders are stored on the card (or something to that effect) and not the actual audio files. I installed the program that opens that type of file, but all it gave me was a white page. I looove manuals and user guides, but unfortunately wasn't able to get it or the model number of the recorder when I went in to the office for it yesterday. The person who had them was gone, so they told me to come back next week. I've just been incredibly frustrated with this. Your mention of having to use specific software renewed my spirits though and I went in search of that. I did find software that is meant to be used with Sony recorders. I installed it and it recognized the folders on the SD card, but is still showing them as being empty. At this point I *think* that the doctor recorded the files wrong. She wasn't quite sure how to use the recorder and is new to it. It has internal memory, so I'm hoping that the files were saved on that instead of being saved onto the SD card. I guess I'll have to wait until Monday to find out!
I appreciate your help! If anyone else has any inklings, please feel free to share. If not, hopefully I get a resolution on Monday.