1) CSV is a text format for presenting tabular data.
Each file line is a row of a table. Column values are separated from one another by a delimiter (comma in this case).
If the value contains a delimiter or a space, then you need to enclose this value into quotes.
2) The CSV file for the `Amasty: Favorite Products` extension should contain the following columns:
In order to allow customers to create wishlists using CSV files, don’t forget to enable attribute ‘SKU’ on the product page. You can edit attribute’s settings here:
Backend - > Catalog - > Attributes - > Manage Attributes - > Edit Product Attribute ‘SKU’ - > Frontend Properties - > Visible on Product View Page on Front-end - > Yes
If you use Flat Product Catalog then you will need to reindex product flat data index here: Backend - > System - > Index Management - > Reindex Data.