Works Spreadsheet Grid Lines

When I copy and paste some info from a Works Spreadsheet into an .RTF, a .TXT or .WPS file the grid lines are there. This was not always the case. I seldom do this so I have not raised the issue previously. If I paste the data into an e-mail the grid lines are not there. Also, I removed the grid lines in the spreadsheet, then copied the data, but the grid lines still appear when I paste it...