Start OpenOffice.org. You can be in Writer, Draw, Calc - it doesn't matter.
Choose File > Open (click the picture to see a larger version of it, if you need to).
The next window lets you specify how the file was created: commas separate the data in our .csv file so tick "Commas".
Also in the same window, if you have date-format data or other formats you want to specify, you can do that column by column.
When you're done, click OK. You'll see the data in a spreadsheet.
Opening a .csv File in Excel.
Click From Text
Navigate to the CSV file you wish to open and click Import
From the newly-opened window, choose Delimited, then click Next
Check the box next to the type of delimiter and tick Commas, then click Next
Click Finish