Question about forcing lowercase filenames

I have a couple questions regarding the use of uppercase filenames with your products. Is there any particular reason? For example the images folder is Images, not images? On a unix server, this will not work if using the wrong case (upper or lowercase)...

Anyhow - I decided that to prevent people from typing in the wrong uppercase or lowercase URLS - I was going to switch all the uppercase urls to lowercase, and then in with apache and the .htaccess file - have it force all the urls to use only lowercase. I unfortunately lost the code snippet that allows me to do this. Do you know how to do this? I know you can do it with the help of editing the HTTP CONF file, but I don't have access to that file - I'm on a shared server and they don't allow it. So I would need to do this only with htaccess. I know it's possible, because I've done it before, but I just can't find the code that I used before. Something to do with rewriting [A-Z] to [a-z] but I can't remember the exact syntax.

Anyone know?

Thanks!