One file with "comma-separated values". TextEdit will read a CSV file (because it is plain text) but it will not separate the values. It is readable as is, at least if you give it a bit more effort than you are giving to figure out how to read a text file on your Mac. You can search it for user names or dates, for example.
Rick "who found TexEdit in 12 seconds of Googling" Denney
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