I don't know why, but from the NVU web site:
"and don't use upper case letters in this and other web page file names; it's easier to remember that that's your habit than to figure out how you might've ended the file name and which letters you might've capitalized".
Maybe it's a readability thing, but browsers really don't care about the casing of page names. I have typed in all uppercase when caps lock was accidently on and the browser navigate to the page correctly.
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