If I'm understanding correctly that you want to know how to find your hand histories and their raw files)
Open your Merge client software (I'm using Carbon as an example).
From the menu options, go to Settings, Hand History Settings.
The current locations field will show where the Merge software is saving your hand histories. (note that you will need to have the Enable Hand History checkbox selected; if you don't, you aren't saving hands from that software so you can't get your hand history that way).
Assuming you do have files saved there, you can open them up in Notepad (on a PC-- I don't know how Mac works)
In my case, I use PT4 and that program takes those raw files, converts them and then deletes them from the original folder. But they are copied into PT4 and I can go to those files and use the same notepad to open them. Then just copy and paste into wherever you need to.
Is this in the direction of what you're looking for?