How to upload heytell clips to mp4 on my computer from my iphone?

I found out how to access their containing folder with winSP, but all files are.caf. So I can open them or listen to them.

How can I fix that? Or is there another way to upload them, thank you.

.Caf is compatible with Mac OS and stands for Core Audio format, If you want to upload or listen to it on a window pc you need Quicktime. I recommend that you convert it to an mp3 file. You can find converters on google, googling ".caf to mp3"