Attached Link: http://www.senosoft.com/

LdyMox, P3dO Explorer - the Poser file manager - has a Rsr2Png and Png2Rsr converter plugin. This plugin has an option enabling to delete redundant files - not exactly what you ask for but it's a cleaner. If you don't know P3dO you need to download P3dO from my web page, or freestuff there, and then go to SENO to get the latest version of Rsr2Png plugin (on the Downloads page). Yarp

Yarp - author of P3DO Organizer for Poser