_xmlextra.pyd is a registry file associated with the Python programming language (as are all pyd files).  It may be associated with the Digsby software that handles instant messaging, email notifying, and social networking functions.

Problems with this file may cause a PC to work improperly.  Some viruses, spyware, and other malicious programs may disguise their files with the name of normally harmless files.  A registry scan can identify these errors.  ZookaWare PC Cleaner offers a free registry scan of any computer.