I've just always assumed it was because windows doesn't care about the case, but I don't know for sure.
Once the new file exists, you can try:
Re: Rename a file long file name from lower to upper case Thread #
801645 Message #
801674
.·*´¨)
.·`TCH
(..·*
010000110101001101101000011000010111001001110000010011110111001001000010011101010111001101110100
"When the debate is lost, slander becomes the tool of the loser." - Socrates
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"De omnibus dubitandum"