It looks like your files are in .csv format (stands for Comma Separated Values). Excel can open that type of file, if you right-click on each file's link and then click Save Target As... (instead of just left-clicking on the link). Unfortunately, it looks like you have the right-click ability disabled on your site.
If you can post those files with the .xls format, then they should open up automagically in the Excel program.
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