Poser was originally created for macinosh computers. These do not need resource files as the resource info is inside the so-called fork of the file. When Poser became available for Win-users, a solution had to be found for the fork-that-was-lacking. Hence Resource (.rsr) files. When a product comes with a .rsr ile, this info has to be implemented into the fork of the mac-file. That is the problem, and the solution was offered by steveshanks.

I have tried prudent planning long enough. From now I'll be mad. (Rumi)