Thankyou for your replies.

I will be running the script on NT. I have tried the following but is does not work.

Break OFF

If 1=Exist("C:\new\FIXServer.log")
Copy "C:\new\FIXServer.log" "C:\new\FIXServerfile@year.@monthno.@mdaynolog"

EndIf
Exit

Should I try the rename command?