Provides a P4V diff tool for Microsoft Word and PowerPoint files (2010 or later versions):
Just run installer and check under P4V's Edit > Preferences > Diff that the tool is installed for appropriate .doc/.docx/.ppt/.pptx extensions.
Installer:
Then just diff Word/Powerpoint documents in P4V and find that Word/Powerpoint is launched in the background with the review options available.