Apparently this is how the file is saved when saving in TXT format.
There is nothing you can do about that in ARCHICAD.
What I usually do in such situations is I open the TXT file in Word, and run a Replace command. I set the "^T^P" characters to be replaced by "^p" (TAB character followed by a paragraph character - which creates a new line - is replaced by a paragraph character.) The effect of this is that it removes the TAB character from the end of each line.
Then I re-save this as the TXT file and then open it in the desired application.
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