Most likely it might be a challenge with wordwrap setting in your notedpad. I also faced a similar issue and never thought it can be notepad issue, but yes it was for me.
Then secondly any blank is normally assumed as break of character strings.
This might help for you, I am not sure though. But the same worked for me.
In my experience and understanding of selected text it is just used to capture the highlighted text. So when you are trying to get data from notepad what andreas had specified is right way you should go with.Capturetext is also another way but in my experience text is a better option. If text is not working then use Capturetext.