I do not know if I can help you, but this is what I do.
I can't stand using any of the photo software programs. I use AOL. If I wanted to change the file type, I'd open the file in AOL, click on "file" and then "save as." On the drop down menu, choose "jpeg" and then click enter. I don't know if AOL will recognize the files you have though.
When you first receive/download these images and are saving them, look and see what type of file you are saving them as.
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