DonorPoint

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.