>>Disabling anti-virus isn't necessary but VFP related file extensions (DBF, CDX, FPT, etc.) shoudl be excluded from scanning.
>
>I did get just the fpt files excluded, but I'm still running into the problem - especially when editing report files (and the missing fpt file appears to be an internal file). Any other ideas as to how to deal wtih this?

Anti-virus could be running on a workstation and on a file server. The VFP related file extensions should be exclude in both cases and all of them (DBF, CDX) not just .FPT.