I'm not on a mac and I'm not sure what you mean by 'line by line'...
but Merge hand histories for each game are encrypted in a single unreadable file on your hard drive and do need converting to text before they are in any way usable outside of the client.
I'm assuming that this is what you are referring to. Unfortunately I'm not sure that Carbon have the solution as there are many independant converters out there (most of them you will have to pay for)
There is a really good simple free web based converter that I know of though
If you google 'allanmc merge converter' (look at the actual addresses in the results) you should be able to find it
Browse to your hh on your hard drive, choose what hand # you want, then convert
After converting you can simply choose another hand # if required
I hope this is useful, let me know if this does the job
Sam