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Comment by efitz | Hacker News Reader

Excel absolutely can open csv files with a double click if you associate the file type extension.

You should never blindly trust Excel when using CSV files. Try this csv file:

    COL1,COL2,COL3 
    5,"+A2&C1","+A2*8&B1"

True, but not the point here. "You can" and "You should as a general rule" are not the same.

Hesitant to actually try to open this, what does it do?