I was having some trouble connecting to the Excel file for A13, and wanted to share a solution in case others are having trouble. If anyone encounters an error message saying "Error occurred connecting to Excel file" here's a link with a solution: http://kb.tableausoftware.com/articles/issue/error-unable-to-open-excel-file
Looks like some 64-bit versions of Tableau are missing a driver for loading in Excel data. I'm using it on a Mac, so maybe others aren't having this issue, but thought I'd share nonetheless.
I am trying everything that I can to upload to the web, but I keep getting a weird error message that says that they were "unable to parse the XML". Here is a link to the problem "solution": http://kb.tableau.com/articles/issue/error-unable-to-parse-xml-response.