SSL is enabled in Apache by default:
The certs are stored in:.\xampp\apache\conf\ssl.*\
README files are included in those folders - drag into a text editor to read.
SSL configuration file is:.\xampp\apache\conf\extra\httpd-ssl.conf
Make certificates using the Command line option:C:\xampp\apache\bin\openssl.exe
Make certificates using the bat file:.\xampp\apache\makecert.bat