You still need Ghostscript. And IrfanView is okay for viewing. But to
access some of the more advanced features (like export, conversation
and text extract) GhostView still is the tool to go for. As long as
one doesn't like the GhostScript command line...
It is necessary to remove references to uninstalled old GhostScript
versions. The IrfanView postscript plugin only tries the first entry
found.