First off, if you are wondering what the SingleFeed file is all about, go here: http://support.singlefeed.com/entries/177053-what-is-the-singlefeed
You can obtain a copy of your SingleFeed file at any time. Just visit the "products" page of your SingleFeed account, then click the "Download my SingleFeed" button near the center of the page. A .csv file of your SingleFeed will be downloaded to your computer. You can then open this file up for viewing and editing in Microsoft Excel, or other spreadsheet software.
Please note that the "Download my SingleFeed" button is temporarily disabled for up to 30 minutes after you import a new file to your account. It takes about this long to regenerate your new SingleFeed.