Had too many years of wrangling core run-times, so I never un-zip direct into Poser. Instead, to eg ThisPC > G: > R > 37 > New Folder. Then, if I'm happy, I'll re-name and link it as an external Poser library.

Another problem is that many props ported as OBJ+MTL from other formats such as MMD (PMX/PMD) have file-names with Asian glyphs. Un-zipping these with default settings of eg 7-zip or IZarc may produce an intractable mess of 'dipthong soup'.  The *free* version of Bandizip will solve that, albeit with an intrusive UI plus nags to update and/or upgrade. After that, 'Google Translate' is your friend....