Quickstore v3.3xL exports to CSV files:
Standard, Professional, and Enterprise editions:
Customers
Inventory
Professional & Enterprise editions (only) also have:
Sales Detail by Transaction
Sales Summary by Item
Sales Invoices
This link is a zip archive containing CSV files generated from Quickstore's sample data:
https://dl.waspbarcode.com/kb/qs/quickstore-v3.3-exports-of-sample-data.zip
https://dl.waspbarcode.com/kb/qs/quickstore-v3.3-exports-of-sample-data.zip