The file extension is 7zip which is a free compression software that you can download and use for Excel etc. Once you have downloaded the software, you can download the attached file, RIGHT click on it wherever you download files to and select extract files. Once you do that pretty much same as WinZip and open Excel file. you can then sort in Excel easily.
I've added a PDF file as well for those that prefer not to use 7Zip.
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