I'm getting this error since I upgraded my mIRC to the latest version (v7.27). It used to work just fine in the previous version.
* /run: unable to open file 'ping 22.214.171.124 -t'
Although, I'm not sure if it's a bug or what, just felt like reporting it. It's no big a deal.
P.S.: "ping 126.96.36.199 -t" works just fine when I type it in the Run itself. It just gives me this error when I'm trying to execute it using mIRC.