I had forgotten about "dots". It is a well know "feature" of TeX that the full file path can not contain any "dots" except for the extension of the actual TeX file.
Some TeX packages may have a way around this (e.g. multidot) but as far as I know, there is no general way LaTeX can handle this. Â WeBWorK users just live without using dots in directory/file names.
Arnie