I found this, maybe helps:
http://support.microsoft.com/default.aspx?scid=kb;en-us;183522


>We have a commercial application that we converted from VFP6 to VFP7 and we are getting reports from a number of users that they are getting Windows fatal errors when the program attempts to write to a file for the first time. So far we have gotten calls from Windows ME and Windows 98 users; however, we know that we have many, many users who are not getting these errors. We also know that these are hardware errors; however, why is VFP7 burping and VFP6 did not???
>
>Any help would be greatly (and I mean greatly) appreciated.