hmm...maybe it's because you have program files/roadrunner instead of program files/road runner...note the space... road<space>runner....I didn't do anything else too make it work..
Edit* what does it do when you click on the pictures button in RR
Edit* i looked it over and it shouldn't matter that theres no space in the path. as long as that's what you used in config
as long as you have
1.this line in your Exectbl.ini
2. imageviewer.skin in the dfx3 folder
3. imageviewer folder in RR's root dir
...far as I know that should work