Direct Mail/listsource/click2mail

[Matthew Parent]

I just purchased my first list from listsource. Seems straight forward. However, the mailing labels download in some file ext I can't convert. I also us a Mac, and therefore, don't have MS Excel. Has anyone successfully converted there list source labels to another format? Especially Mac users. I went to upload that to Click2mail; however, click2mail doesn't recognize the file. Maybe I'm crossing too many players that don't talk to one another.

Thanks for any help.