Just to add to this.. I have had a situation in the past where a users opened a DBF in Excel and Access (which did not use the CDX) and modified records and corrupting the CDX. Could also account for the 'File Access Denied' error.


>even though your users only have read access to these tables,
>they might be able to affect the .CDX if they abend your application
>instead of exiting gracefully. check with your users to see
>if any of them did Ctl+Alt+Del and End-Task. (they may or may
>not admit to it).