A vcf file is just a text-based tabular format, you can open it in any text editor or on the command line with commands such as less, head or tail. The latter is safer if the file is large. Excel would basically be an option, but you probably would need to rename it into .txt to be recognised as an accepted format. The delimiter is tab. By default your Mac interprets VCF as the format used to store contact data in your Contacts app. I am not familiar with GA, probably the same.