@Llamavis. Thanks for your question. In all honesty, though, I am not sure that it will list the contents. I think that it should be able to list the contents, but when you enable linking to the files the link will be broken.
However, I just want to point out that you forgot your single quotes. You should have:
{easyfolderlistingpro folder=’R:/xxx/xxx’|ratio=’3’|extensions=’1′}
OR
{easyfolderlistingpro folder=’R:/xxx/xxx’|ratio=3|extensions=1}
You don’t need to have quotes around the numbers, but I normally put them.