At least since release_8.0.6-478-g9ee8e2 (encoding utf-8) If i'm using a link which contains the character "=" the character in the target is replaced with "%3D", at least for export to html and latex.
[[http://example.de/?idprop=222][http://example.de/picture.jpg]] -> <a href="http://example.de/?idprop%3D222" > <img src="http://example.de/picture.jpg" /> </a> ---------------------------------- #+BEGIN_LaTeX \begin{window}[0,r,\href{http://example.de/?idprop=222}{\includegraphics{picture}},{}] #+END_LaTeX -> \begin{window}[0,r,\href{http://example.de/?idprop%3D222}{\includegraphics{picture}},{}] With an very old version of orgmode 7.93 this was for a while standard for the latex exporter, not for html. Cu, Robert