Extensions » Modules » Export Manager
In new installations, the module provides two ways to download / view your form submissions: as an Excel spreadsheet or in an HTML printer-friendly format, which has three sub-options: table format, one-by-one and one submission per page. There are also two other export methods, hidden by default: CSV (comma separated values) and XML. Depending on your needs, these can be enabled by the click of a button. But most significantly, once you learn how the module works, you can construct whatever other formats you need.
The Export Manager, used in conjunction with the Core Views feature, acts as a fully fledged Report Builder, letting you view and export whatever subset of the form data you require. You also have the option to only show the export formats for particular clients, particular subsets of your data, and particular forms and Views (version 2.0.0 of the module and later only). It's VERY powerful!
One final note before we leap into the nitty-gritty: for you programmers / advanced users out there, the Export Manager functionality can be utilized via the Form Tools API to extract and display Form Tools submission content in your own pages. See the Advanced Usage section for more info on that.