Thanks all for the advices of different magnitudes..
Tree analyzed the situation correct, the resulting file after adding the
received parts together became by some reason corrupt, so when I started
from the beginning again and making a new binary file "tr612.txt", the
conversion process worked smoothly.
In situations like this, there are two things I am pleased about: The first
is the fast support from Tree, and the second is that being retired and in
full control of your own time is a must when practicing as a computer amateur!
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