After downloading the vcard2xls combine all the contacts into 1 file by following the steps below.
Step 1. First Copy all your vcf files into one Folder/directory.
Step 2. Open Windows command prompt (Windows + R),and then type “CMD” to open command prompt and navigate to the destination folder where all your contact files are stored (you can type "CD YOUR PATH" command to reach to your destination).
Ex: you have copied your vcf files in folder named “Contacts” then in command prompt type in “E” drive
Step 3. Enter the following DOS command: copy *.vcf all.vcf
now a "all.vcf" file will be created
open the "vcard2xls" and open this "all.vcf" file.it will be converted into xls format and then save it.
finally you will get a xls file with all the contacts in one file.