I am not sure about where all of the quote data is but you can find a excel spreadsheet on the IStechsupport website that lists all of the file names along with a description.  Click the Services tab and go to the free downloads.
 
I have used it for many of my reports.  Please note that this is a an old file and some info may be out of date now that we have all of these handy upgrades.

I wrote up a 'Customer Quote Margin Analysis' report.
It used:
 
BKESTQT - Quote Header
BKESTQTL - Quote Line Item
BKQTNOTE - Quote Notes
BKARCUST - Customer File
BKICMSTR - Inventory Master
MTICMSTR - Inventory Master
BKICPMAT - Pricing
 
Hope that helps