I briefly looked into this "bug" a while back. I'm pretty sure it is Win32 only, and was something to do with the stdio not supporting UTF8. I think skid knew a bit about this one, and you might be able dredge something up from one of his posts? It's certainly not the GUI controls, as the following spews rubbish when run from the command line, not just in the IDE.
For i = 0 To 255 Print Chr(i) Next