Cancel, replace, append serial port file?

I have a serial port on my CentOS5.2 VM. It uses a file (instead of a named pipe or a physical device). I use it to get the console output.

Problem is, every time the VM starts, I get the following query:

msg.serial.file.open:Serial port output file "/space/vm/CentOS5/console" already exists.
Do you want to replace it with any newly created content, or append new content to the end of the file?

Is there a way to make 'append' the automatic choice?