To clarify, I was wondering if "open with" by itself (nothing to do with P3dO) would work So was I, it is worth trying with P5. The config file for most common files is a good idea, all files will be proposed for deletion but those special ones will require a confirmation. And yes I also think it is dangerous to definitely delete some files (like objs), I still wonder how to cope with this and windows.

Yarp - author of P3DO Organizer for Poser