First, you need to be patient when posting,... give 24 hrs before bumping your thread with another response... I see you've done that,... but remember, not everyone who uses Cedega or WineX necessarily uses your game. Also, some people who have not experienced your trouble may not have a response for you even if they do play it.
As to the Cedega question,...
Cedega maintains a seperate "registry" of sorts for the programs that are installed to it. Secondly, a program that is installed on a NTFS drive will not work properly in Linux, even using Cedega, because NTFS drives are supported for read-only functions in Linux.
Sometimes it is possible to fool Cedega into running games installed elsewhere, but it is by no means simple.
Go here for more information. You may have to go back to a previous version of WineX to get Baldur's Gate 2 to play.