I wanted vcards or .vcf files to uploaded and downloaded from a joomla site so the customer could update them themselves.
I had K2 installed on the site and it was easy for me to download the .vcf file, but uploading was unsupported.
JCE was installed and I discovered that JCE “File Manager” add-on has an allowable file extensions built in. It was easy for me to add the extension. Then I used “JCE File Browser” to upload the files. Here is the article that helped me out.
I hope this helps someone else out there…