Hi Nikolay, Thanks for your reply. I checked a few things today: I am using Org mode version 9.0.9 (9.0.9-82-gb862c2-elpaplus, org-plus-contrib-20170814/) and the unofficial emacs build GNU Emacs 25.2.1 (x86_64-w64-mingw32) of 2017-04-24 from http://sourceforge.net/projects/emacsbinw64/ (supposedly straight from original sources).
> emacsclientw.exe > "org-protocol:/capture?template=w&url=http%3A%2F%2Fjira%2Fbrowse%2FSDST-705&title=SOMETHING&body=" 1) Without any patch/advice, calling emacsclientw directly on this address (modulo template letter) works fine, as does a call with the full executable path. I think the path prefix is weird, but fine with me. The culprit (independent of the prefix) is the "/" before the query string. So thanks for narrowing this down, first of all. 2) Just a side note: store-link (instead of capture) shows the exact same behavior. 3) Here are the bookmarklets I use... >------------------------------------------------------------------------------< javascript:location.href='org-protocol://store-link?url='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title)+'&body='+encodeURIComponent(window.getSelection()) javascript:location.href='org-protocol://capture?template=y&url='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title)+'&body='+encodeURIComponent(window.getSelection()) >------------------------------------------------------------------------------< 4) ...and the registry entries >------------------------------------------------------------------------------< REGEDIT4 [HKEY_CLASSES_ROOT\org-protocol] @="URL:org-protocol" "URL Protocol"="" [HKEY_CLASSES_ROOT\org-protocol\shell] [HKEY_CLASSES_ROOT\org-protocol\shell\open] [HKEY_CLASSES_ROOT\org-protocol\shell\open\command] @="\"C:\\Program Files\\Emacs\\bin\\emacsclientw.exe\" --no-wait \"%1\"" >------------------------------------------------------------------------------< I think this is all as it should be, and I have tried to make the minimal changes to get a working system. 5) Soooooo the remaining puzzle: How can the "/" get in there? As I said, it happens when called from both FF (although I have not used that for a few weeks now) and Iridium. It seems to happen somewhere b/w the browser and emacsclientw, ie, in the Windows "protocol" handling, I suppose? If other people can confirm (or even explain) this behavior, we could decide if there should be a transformation on the FNAME argument. In that case, it should definitely leave the leading executable path alone. Thanks a lot so far! Ingo