In the Safari browser, the default browser on Apple products, exports of lists and reports from Big River look weird:
This is because Safari opens the comma-separated-values format (CSV) itself instead of another application or downloading it by default. To save these results in a file so that you can open them in a program like Excel, you have to explicitly save the file. Once you see the strangely formatted text like the image above, do the following: right-click on the body of the page and select "Save Page As..."
The file browser will pop up allowing you to give the file a name and put it in your desired location. Make sure to set the format to "Page Source" to get a usable file.
You can then open the saved file in your spreadsheet program - Numbers from Apple, Microsoft Excel, etc.