I agree with the others, if it is a .dll file you need to be leary.  Unless you are installing an actual program instead of a runtime, a dll file should not neccessary.  I did a search on line for the file you mentioned and get no feed back on such a file.  poser files usuall come in a zip, rar, or runtime.  The zip and rar usually decompress into a runtime.  In this runtime you can view the item as it is what you would install in Poser or daz.  There is a program that is free called universal extracter.  This will unpack most installers, zips, rar etc.  Then you can have a look at what is contained in the file.  You can get it http://universal-extractor.softlate.com/?gclid=CLWz4tWQzKcCFQY65QodQB33Eg