Sometimes if you open a Mac text file (and a CR2 is just a text file) in a Windows text editor the line breaks will be invisible and it will look as if the end of one line runs into the beginning of the next. This is because the Mac uses one character (10 or 13 - can't remember which) to mark line breaks where the PC uses both 10 and 13 (line feed and carriage return respectively). It doesn't confuse Poser, though it does make it harder to spot errors.