\documentclass{book} \usepackage[extension=xxx]{hyperref} \begin{document} A\footnote{\texttt{abc}} \href{file://localhost/d:/test2.ps}{foo1} \href{file://localhost/d:/test2.pdf}{foo2} \href{d:/test2.pdf}{foo3} \href{d:/test2.ps}{foo4} \href{http://www-fourier.ujf-grenoble.fr:80/cgi-bin/zbfr/ZB/math-fr.html?AU=Taylor,+R&format=complete&type=html&maxdocs=10}{weird} \href{a%b}{hello} \end{document}