Exclude one folder in htaccess protected directory

Just create an .htaccess file in the subdirectory with the content:

Satisfy any

According to this article you can accomplish this by using SetEnvIf. You match each of the folders and files you want to grand access to and define an environment variable 'allow' for them. Then you add a condition that allows access if this environment variable is present.

You need to add the following directives to your .htaccess.

SetEnvIf Request_URI "(path/to/directory/)$" allow
SetEnvIf Request_URI "(path/to/file\.php)$"  allow
Order allow,deny
Allow from env=allow
Satisfy any