c_g_desktop_app_info_launch_uris_as_manager_with_fds

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
int function(GDesktopAppInfo* appinfo, GList* uris, GAppLaunchContext* launchContext, GSpawnFlags spawnFlags, GSpawnChildSetupFunc userSetup, void* userSetupData, GDesktopAppLaunchCallback pidCallback, void* pidCallbackData, int stdinFd, int stdoutFd, int stderrFd, GError** err) c_g_desktop_app_info_launch_uris_as_manager_with_fds;

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