The way to apply SSL to a particular subdirectory I used is modified the httpd-vhosts.conf like that (Redirect)
<VirtualHost *:80>
ServerAdmin admin@localhost
DocumentRoot "C:/wamp/www/"
ServerName MyName:80
ErrorLog "C:/wamp/logs/error.log"
TransferLog "C:/wamp/logs/access.log"
Redirect permanent /SUBDIR
</VirtualHost>
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WampServer English