It's rather `g_path_skip_root` in https://github.com/geany/geany/blob/master/src/build.c#L1243 which removes `c:` (or `d:`) from the URI passed to the browser. I justed on Windows with Firefox that passing the path root will work and it does. So we could just remove `g_path_skip_root` on Windows (on non-Windows systems it should be OK) to resolve this issue. Maybe this introduces other issues as side effects of this change, so it needs some testing. Hence, here are some binaries with this change (built from GIT master, be careful): Geany: https://download.geany.org/snapshots/geany-1.32nightly20171015_setup.exe Plugins: https://download.geany.org/snapshots/geany-plugins-1.32nightly20171015_setup...