For PRL Reporting Software Options A and C, your report is contained in text files (extension .txt). For Option D, report data is in Microsoft Excel files (extension .xls or .xlsx).
If you upload files through the website, your files may include text files (extension .txt), Microsoft Excel workbooks (extension .xls or .xlsx), and “zipped” file collections (extension .zip).
If your Windows computer is not set up to display file extensions, use your mouse to right-click on the file. Choose Properties. The extension is listed on the "General" tab in the Files of Type field.