May I ask why you want to do this? whenever you type an 'A' vs. an 'a' it's actually a very different value. The OS has to render those filesnames based on thoese values. I am wondering if you are wanting to do this for a program that you are writing or for personal visual effect?
No, it is just a mistake I need to correct. All images in my website (750 pics) have an uppercase string (the N - e.g. No1_pic.jpg).
I know I could write a PHP to change filename, but I have no time (deadline soon). So, I was just wondering if I could something using Windows command. If not, I will have to use the batch process of Fireworks to batch and copy.