How can I convert Excel file data to .csv format?

I'm trying to compile a database of groups of data (strings of numbers and street names) from downloaded Excel format to a format of CSV (comma separated value). Word, Notepad & Wordpad don't seem to offer the .csv extension and I need something to enter the data into a text box submission form. Alternately;... show more I'm trying to compile a database of groups of data (strings of numbers and street names) from downloaded Excel format to a format of CSV (comma separated value). Word, Notepad & Wordpad don't seem to offer the .csv extension and I need something to enter the data into a text box submission form.

Alternately; does anyone know of a program/script which will automatically enter this data for me?

Any help is appreciated.
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