Hi.
Passing parameters to a report or not passing them cannot be your problem.
Probably you have to analyze better the issue.
You could only need to try to export file in unconverted txt format and check out if there are still problems with long text.
There's a note too about this issue
SAP Note 855314 - Downloading a list from the ALV to
Excel
You download a list that is wider than 1023 characters from the ABAP List
Viewer (ALV) to a local file as a spreadsheet. A line break occurs after
1023 characters. The list appears in Excel in this way.
This corresponds to the SAP standard.
Solution
To prevent a line break occurring when you download the list as a local
spreadsheet file, you must reduce the width of the list in the ALV.
You can do this either by hiding columns, or by changing the column widths
in the ALV.
Hope to help.
Bye