Non printable characters are not displayed under windows7

When there are non-printable characters in text, those can be viewed under XP but not under Windows 7. I have sameple c# program on skydrive to show this issue. When you run this program on XP computer, you will notice non-printable chars at the end. You wont see them when you run the same applicaiton on Win 7 OS. Is there some setting or some solution to this issue?

https://skydrive.live.com/redir?resid=18C0A13619AAF2B7!162&authkey=!ANsfHvQbNdTHwaY

copy display value and click on the paste button to add text with non-printable chars to datagrid.

Thanks in advance.