I have a bit more information to add to the above. We are on Update 12/21/08. We are also unable to open WO-G through WO-J or AR-C. At first I thought it was just a problem related to adjusting inventory but apparently AR is also affected. The only change we have made to the system was updating the tax table but that was three days ago.

Your problem will soon come back.  The file has exceeded 2 GB in size and reindexing may have packed it slightly below but it will soon surpass 2GB again and the problem will be back.  The file contains data used by System Manager - AI-C & D reports so if you never use those reports you can initialuze the file UT-A, program DBAIF which will delete the file and replace with a new clean empty one.  
 
You should sort your data folder by size and see if you have anything else approaching 2 GB.  If it is not something you can clear, you will need to upgrade to the current Pervasive version which has a setting you can turn on to enable files larger than 2GB