Hello,
the Information on How To Create Plugins can be found on the TotalCommanger PluginPage
http://www.ghisler.com/plugins.htm
or as Link:
http://ghisler.fileburst.com/plugins/wcx_ref2.20.zip
in this Zipfile you will finde the Plugin-Interface Description
for the Packer-Plugins (WCX)
the Viewer Plugin Interface is the under Lister Plugins (WLX)
Best Regards,
TWPhoenix