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beautiful - works like a charm.
FYI, the initial file size was 1.25GB. I encountered a TextPad error "Out of memory."
I used GNU sed to create 3 smaller files (~ 350 MB each) and your instructions worked perfectly.
Thank you.

I have a big text file where each line is terminated with CRLF (i.e. a standard windows text file).
I have used unix sed to add a pipe at the end of each line.
Each logical file in the big text file is separated with $$$$.
$$$$ is on its own line.
I have removed the pipe from lines with $$$$.
I now ...