http://bugs.winehq.org/show_bug.cgi?id=8166
--- Comment #11 from Rico kgbricola@web.de 2009-05-03 04:19:38 --- I could confirm the bug with the test file running wine's notepad on wine (wine-1.1.20-108-g445567e).
Running winxp's notepad on wine crashes, too.
Running wine's notepad on windows could at least load the file without problems.
PS: wine's notepad (and wordpad) have a limitation on 32K chars in a document. You couldn't put more in it (regardless if they are in one line or not). But this could also be another problem. But you could load much more from a file.