Opening .mms files saved with New PC Studio

Hi. I'm hoping someone here can help me out since I can't seem to find a solution myself. I used the (not intuitive) New PC Studio to transfer my texts and multi-media messages from my phone to my computer. I was able to open the texts after doing a search and finding others had success with using MS Access to open the .nef file. The .mms files, however, I cannot open. I tried Windows Media Player but that didn't work. I can't find a program that is compatible with the .mms extension. I even downloaded Nokia's Multimedia Player because it supposedly opens .mms files but when I try it gives me an error saying the file cannot be opened. I really want to open these files, as I have deleted them from my phone since my inbox was full. Does anyone know what program to use to open the .mms files? It seems like a useless feature of PC Studio at this point, if I can't even open what I've saved. Thank you in advance!