Ok, that's make the file to be read and you can choose the new file at popup menu, but once I make any modifications, it seems to be corrupted and the game freezes at start. Im using excel 2010 and tried all .csv formats available, including UTS-8...
In other words: once the file is renamed without the underscore and you choose the new file in the popup it is fine, but any modifications in that same file makes the game stop to work for me. If I delete it and replace with the previous one, game loads normally.