A little thing that could be overlooked but, IIRC, Mac and windows record line breaks differently. I'm unsure of how os x handles line breaks, but being a bsd core, it might use unix line breaks.

for windows, cygwin tools has a dos2unix converter, if os x indeed stores as unix. os x might even have a similar program installed.

I haven't used os x at length, but I've struggled with files going between windows and linux machines enough that I know it's way too easy to forget about. HTH