I just verified this in Lion and am pretty sure the same thing happened in Snow Leopard when I created the original files. Removing the extension just in the Finder did only hide it on my Mac, SnowLeo. You can always try it without removing the file extension and prove me wrong. For best results do therefore check with CMD-I what the filename really is!! Thank you! Glad my comma thing helps, I really think it should be the standard. You can see the file extension in Finder if you do the following: I should probably add the comma with no decimals too, as this is something I use all the time and Excel does this so poorly. I also added the comma with no decimals to all cells.
