# add .plp if a file exists with .plp appended (topdir only)
RewriteCond %{REQUEST_FILENAME}.plp -f
RewriteRule ^/*([^/]+)(.*) $1.plp$2
# add .plp if a file exists with .plp appended (topdir only)
RewriteCond %{REQUEST_FILENAME}.plp -f
RewriteRule ^/*([^/]+)(.*) $1.plp$2