opam command not found

[paraflu]

Hi, I've having some issue installing Ocaml + opam due to bash.exe installed on win10. Well, I've removed all and routed to a virtualbox.

But the problem is on my windows shell, on prompt (cmd.exe) I've the message

Microsoft Windows [Versione 10.0.14393]
(c) 2016 Microsoft Corporation. Tutti i diritti sono riservati.
"opam" non è riconosciuto come comando interno o esterno,
 un programma eseguibile o un file batch.

C:\Windows\System32>

I can't find any reference on c:, on registry. I've looked in nsi script but I can't find where remove it.

I've solved make an empty opam.bat in system32 folder. Some cleanly solution?

thanks!