Just cluthching at straws here.
The 2 gig limit was a hold over from the days of FAT32 (correct me if I am wrong). NTFS can handle just about any limit.
BUT as most of us are using 32bit processors - They can only address 4 gig of memory. Could there be something in the way Besweet is programmed, to be affected by this limit
(like searching to the end of the file and running out of steam at 4gig)
Just my 2 credits worth