The necessary .bat file should be included with the base V4 package.  Unfortunately, I am nowhere near my computer to direct you the target file.  Someone else might chime in.  The other concern is where PP2012 is installed in relation to it's content.  If you followed the installation procedures for PP2012, the core program should be in your Program Files and content placed in your share folder, such as Documents.  This is where your M4 and V4 should be installed or their own runtimes linked to Poser.  However, if you decided to install content to Poser's runtime folder then you may experience UAC interference within Window 7 which will disrupt access and functionality.