Install Ionic's Isapi Rewrite Filter http://iirf.codeplex.com/ and use this rewrite code:
RewriteRule ^(.*)billingapi\.aspx(.*) - [L,NC]
RewriteRule ^(.*)filemanager_upload_frame\.aspx(.*) - [L,NC]
RewriteRule ^(.*)filemanager_upload\.aspx(.*) - [L,NC]
RewriteCond %{HTTPS} off
RewriteCond %{SERVER_PORT} ^80$
RedirectRule ^/(.*)$ https://%{SERVER_NAME}/$1 [R=301]
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