The way to create a dummy file is to open notepad on a PC, type in some jiggerish, and save it as Poser.txt.  Close the application, locate your text file and change the extension to exe.  Go into the folder where Poser is installed on your hard drive, double check that 'Poser.exe' does not already exist (don't want to overwrite the original file) and afterwards place the converted text file into the folder.  I haven't looked yet but I am assuming that Poser 8 does not follow the old Poser.exe convention from previous versions excluding PoserPro.  Afterwards, try reinstalling your V4.1.