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TXTRIM <ascii_file>,<converted_file>,<length>,<char> 
increases the length of each line in <text_file> up to <length> characters
by inserting characters <char> at the end of each line.
Default <char> is a space.
The result is saved in <converted_file>.
If any of the lines is longer than <length> characters,
an error message is given and the process is interrupted.