A weird tech question

I've got some file fragments on my computer left over from a hard drive crash a while ago, and I've been going through them looking for the remains of some text files I'd rather not have lost.  A couple of them, though, are apparently too big for me to open either with Notepad or in DOS Edit mode without the system hanging.  Is there any other program I can use to get at the contents, or is there a way I can somehow break them into pieces of more manageable size?