When I save a file on the Mac, I type the .jpg at the end of the file name...e.g. flower.jpg
This is the easiest way to get the PC to read it...even if you have the .jpg ending showing as the way you want the file saved.
We had a problem until we started doing this...
> How do you get the file extensions to show as part of the file name on Mac
> files? I figured out how to do it on photoshop files (getting them to read
> .pict or .jpg) but how do you set the computer so that all file names show
> the extensions? This is important when sharing files between mac and pc