Why don't you try the good old fox-dos way of dealing with this?
Try the following:

set alternate to thefile.txt
set device to alternate
set alternate on

CurL = prow()
@ CurL, pcol() say TheHeaderData
@ CurL+1, pcol() say StuffFromTheSecondFile
close alternate
set device to screen

You can also close it and reopen it in append mode:
set alternate to thefile.txt additive

Also, you need to set device to alternate only if you want to use the @ say command, otherwise, you can use the ? or ?? commands, and then you won't need to set device to alternate.

HTH
Jaime

>Thanks everyone for your suggestions - I will work through them and let you know how I am getting on... Thanks again...