I am using Windows environment.

OK I know what is happening.  The difference in case format filename or file extension is not processable by Poser 7sr3.

The genital MAT PZ file refers to a file name with lower case letters in the genitals texture problem.

The whole body and face MAT Pz files are referring to the upper case letters in the file extension.

I can manually change the case format of the texture filenames to satisfy Poser, according to what is referenced in the MAT Pz files.

However, for the sake of other customers, it is best to amend the product so that the case of the filenames or file extensions  match those which are referenced in the MAT Pz.

Thank you.

Eternal Hobbyist