fallback to regex match when extension is not present or recognized

services/importer/lib/importer/downloader.rb

@@ -347,7 +347,17 @@ module CartoDB
       def filename_from_url
         filename = CGI.unescape(File.basename(URI(@translated_url).path))
 
-        filename if filename.present?
+        extension = File.extname(filename)
+        if extension.present? && self.class.supported_extensions.include?(extension)
+          filename
+        else
+          regex_match = self.class
+                            .url_filename_regex
+                            .match(@translated_url)
+                            .to_s
+
+          return regex_match if regex_match.present?
+        end
       end
 
       CONTENT_TYPES_MAPPING = [