“ I haven't tested this on Apache but I see no reason why it shouldn't work. Did you follow the steps outlined in the article? I just realized that step 5 is a little bit ambiguous, by restart the web server I meant restart the entire machine, not just IIS or Apache. You need to restart the whole machine for the environment variable change to take effect. Without that, the extension can't spawn processes from the external libraries in the wsf_c directory that it needs to run. ”