You may want to try to determine if a particular record causes the problem. You may have a record in your text file with non-text characters or something else that is killing VFP.

>I am running VFP 5.0a on an NT 4.0 server and am
>simply importing data from a text file. I read
>the text file to a cursor, read the data from the
>cursor and then conditionally add the data to
>one of two tables (debits or credits). These
>are large tables (4 and 7 million records).
>
>Now when I get so far (about 70%) through a 15,000 record
>file (loads ok to the cursor) I constantly get the
>following error:
>
> vfp.exe - Application Error
> The exception unknown software exception (0xc00000fd) occured
> in the application at location 0x00401387.
>
>After clicking cancel (to debug) then next messagebox shows:
>
> Unhandled exception in vfp.exe 0xC00000FD: Stack Overflow.
>
>The same program has worked fine and brought in the data from the previous 600+ text files.
>
>Any ideas?