seems to have worked for me.
the caveat being I've had issues where the service seems to hang in 2012 and 2012 R2 and SW nor snmpwalk can get response until the service is bounced...then comes back fine. this seems to happen intermittently or sporadically.
How do you actually define a file directory for 2012? My drop down list only allows me to choose up to windows server 2003....