If you use PFS with extra plugins, it will take his time to start, This could be boring if you have not to edit, but only to browse .pfi files
And , if in the same folder that you want browse there are also Gimp or Pixia or Photoshop files ...then could be really a nightmare,since any time you will click on a different kind of file you will open the associated graphic editor
( and sistems could crash if you open simultaniously Gimp ,PFS and Pixia or Photoshop)
But the last release of Xnview ( http://www.xnview.com ) could solve the problem, could read pfi (and Gimp and Pixia and a lot more) files ,making more easy to browse them, even in slideshow (this require just 1 more click)...
(but i think it's possible...)