>I am exporting data to a csv file using STRTOFILE. I set safety on before i issue the command and it prompts me to overwrite if the file already exists.
>
>How do i trap the reply (ie. 'yes' to overwrite, or 'no' not to)?

You cannot. You need a function to return a value. That's why Borislav did this:

m.bOverwrite = (MessageBox([Overwrite?],4+32+256) == 6)