PMD files are Poser Morph Data files, but that extension is also registered as many other types of application files, including Pagemaker Data files and other unrelated things.

PMD is not your scene file, but some morphs for something that was in the scene.

Perhaps you're not aware, but Poser 6 has problems with PMD files (not all, just certain situations). Many have reported that PMD files used in conjunction with DAZ's V4 absolutely crashes Poser every time.

PMD are used because you have a preferences item selected to Use External Binary Morph Targets. If you turn that off, Poser will not make PMD files anymore.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)