You can achieve a line break in a string by inserting the following special characters:
mStr := "Text Zeile1" & Chr(13) & Chr(10) & "Text Zeile2"
Chr(13) is the so-called carriage return and Chr(10) is the line feed to the next line. The terms still come from the operation of typewriters.
Some foreign applications expect only Chr(13) or Chr(10) for line breaks.
Alternatively, the constant CRLF can be used:
mStr := "Text Zeile1|CRLF|Text Zeile2"