helpme -- you don't import or export the QWC file, you run it. It doesn't run from Quickbooks, it runs from Quickbooks Web Connector. You need to download and install Quickbooks Web Connector. Get it here: http://marketplace.intuit.com/webconnector/

pglock -- Not sure what a tax code is. You just need to put the name of the tax here. If you can click on Items and Records (top right hand corner in QB Home) in QB and take a screenshot of the page with the sales tax items on it I can tell you what you need change.