# DirectoryIndex azimuth.cgi
# RewriteEngine on
# RewriteRule ^([^/]+)\.txt$ azimuth.cgi/$1 [L,QSA]
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteCond %{REQUEST_FILENAME} !-d
# RewriteRule ^(.+)$ azimuth.cgi/$1 [L,QSA]

Options -MultiViews
RewriteEngine on
DirectoryIndex azimuth.cgi
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^[a-z]+$ azimuth.cgi [L]