Actually, not sure it works. Your code requires to load the whole
200MB file into memory in one go. Which would be probably faster than
having an access to the drive for each line read/written. But that's
going to be a big ask for Excel. Actually can a single string contain
200MB of data?

I actually have another question: I never really understood the
meaning of the "#" character before variables, or the "$" sign after
the name of the function. How different is it from simply using mid()
or filenum?

Charles