What file holds all the order and customer info ?

what file(s) holds all the customer information and orders ?

i just did a fresh install from 3.0 to 3.6

can i just FTP these files in and have them show up properly ?

No. They're not help in files, they're help in database tables so you can't really FTP them at all. The customer and order tables are not independent of the rest of the system - the orders_products table for example holds product IDs. If those product IDs don't exist in your new install, then something is rather likely to wrong.

However, it's unclear what you are trying to do here - is this an upgrade or a clean install?

I did a clean install . I had some issues i didn't really know how to resolve .

No big deal. I still have their info . i will just have to manually add it to outlook or quick books.

thanks for the answer

Unless your database is corrupted, you can replace the database from your clean install with your old one and then run the database upgrade process.

If there is stuff in your old database that you want to lose, you could try restoring the data in the customer, customer_info, address_book and address_format tables which seems to form a a self-contained group.