after i convert the file which one do i add to the sim? the bglfs9 extension or the other one?
The .bglfs9 files are backups of the original files, still in FS9 format, so you want to move 'the other one'.
Are you going to use the WoAI installer to install the packages to FSX?..or are you simply going to copy the aircraft and traffic files from FS9 to FSX?