I occasionally do a little bit of clojure development on my Windows
7 box, with emacs as my editor of choice. To make life easier, I
had associated emacs with the clojure source files,
i.e. "*.clj". At some point, the behaviour changed when I
double-clicked on a clojure source file. Emacs was invoked but only
after a command window also appeared. That didn't happen on my work
laptop, also running Windows 7. What was going on?
The reason appeared to be that I had installed a later version of
Emacs (23.3), upgrading from the 22.1 release. I had placed this is
a new directory, C:\emacs-23.3, so as to leave the older
version intact in case of problems. Later, after a distinct lack of
problems, I had blown away the directory containing the older
version. However, some Windows registry settings still referred to
the older version, which seems to cause problems.
The key in question is:
Computer\HKEY_CLASSES_ROOT\clj_auto_file\shell\open\command
which was still set to "C:\emacs-22.1\bin\runemacs.exe"
"%1". Modifying this to refer to the installed version of
emacs solved the issue.
