>The above error is generated when I attempt to zap a table that lives on an NT server drive, when it exists. If it doesn't exist, it is copied out of my executable, where it is carried just case it is not found.
>
>Even though the table is successfully created(copied) and opened exclusively, any command that attempts to lock the file's header generates the above error.
>
>Examples of commands causing the error are: insert into; pack; zap; delete while not eof().
>
>If my destination drive is a local drive instead of my server drive, all is well.
>
>Help,
>
>Clueless

Sounds like you don't have Write access to the network directory.