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You have a .tsv file — it's CSV's more responsible sibling. Instead of commas, TSV uses tabs to separate columns. This solves the most annoying CSV problem: what happens when your data contains commas. With TSV, commas in data fields are just commas. No quoting gymnastics required.
TSV is the preferred format in bioinformatics, computational linguistics, and any field where data values frequently contain commas, semicolons, or other punctuation. BLAST output, Gene Ontology annotations, and linguistic corpora typically ship as TSV. The format is also what you get when you copy cells from a spreadsheet and paste into a text editor — the clipboard uses tab-delimited format.
Any text editor opens TSV files (the columns won't align perfectly, but the data is readable). Excel and Google Sheets import TSV — in Excel, use File → Open and select the .tsv file, then choose "tab" as the delimiter. LibreOffice Calc handles it automatically. For converting between TSV and CSV, most text editors support find-and-replace of tabs to commas (and vice versa).