Hi John.

>This error comes up occasionally in an application which I have written. It happens when reindexing the file.

This generally happens when a workstation crashes or is rebooted without properly exiting FoxPro. The problem is almost always very simple: the blocksize byte in the FPT header gets set to 0, which is an invalid value. The fix is also simple: open the FPT with FOPEN, FSEEK to the blocksize byte, and replace it with the correct value (usually 64).

Doug