Converting from outlook file to ical file

Ok, this may be simple...this may be confusing. Either way I searched around and didn't find anything that pertained to my situation. I have an "outlook" file that I downloaded from the web and would like to convert it to work with ical. Either vcal or ical format is fine as long as it works. The file has a .csv.txt ending on it and supposedly can be imported into outlook although I have not tried this. Does anyone know of an easy way to convert this file to open in ical?

Any help appreciated! Thanks everyone!

Tony