I am currently dealing with a very large Excel file that contains thousands of contact records, including names, phone numbers, email addresses, and other details. I need to convert this Excel contact file into VCF (vCard) format so that I can import it into my mobile phone and email applications. The main challenge is that the Excel file is extremely large, and when I try online converters or basic tools, they either crash, skip contacts, or cause data corruption. I am also concerned about data...