Use open_file() and not run_command("open_file")
Use open_file() and not run_command("open_file")

run_command("open_file") seems to be bugged on Windows and apparently
there's a native API call that does exactly that. Fixes #20 and #23.

ryanmaclean/Gist,NetoBuenrostro/Gist,condemil/Gist,NetoBuenrostro/Gist,ecode/Gist,ecode/Gist,ryanmaclean/Gist,Ideabin/Gist,Ideabin/Gist