Diana, The files 'DropsP5.pyd' and 'DropsP4PP.pyd' should both be installed in the same directory as the 'Drops.py' file although placing them in the 'RuntimePythonDLLs' folder may work as well. Note the different extension between the .py (Python) file and the .pyd (module) files. Strictly, the DropsP5.pyd version is only required for P5 and the DropsP4PP.pyd is required for Poser 4 ProPack, if you want to save a bit of disk space. Beyond this, the only files that need to be put in specific directories is the geometry file. Waldo, That does sound like a Windows unzipper error message and still likely a corrupted or prematurely terminated file download from the site (these things do happen from time to time). If you haven't already, try downloading the file again. Bill