This is a very simple solution I found searching the forum and works great. No download req'd. Simply type "purge" in the system window opened to your working directory.
"In Wildfire, & WF2:
Top toolbar: "Window", "Open System Window", "Purge"
will get rid of old file versions of parts, assemblies, and drawings.
Make sure you are in the right working directory.
Also check the achieves in the model exploder for: [model] "RE: Wildfire Save and Purge command" if you are using intralink - read the warnings." -- David Krumwiede