It is very easy to change config.nt by one kixtart command.
You should using WriteProfileString.

In your case the can be:

code:

---

$error=WriteProfileString("c:\winnt\system32\config.nt","common","files","200")

---

The structure of config.nt file is standard dos and it can have the format:

code:

---

  [common]
  <keys>=<values>

---

Possible problem:

code:

---

  [common]
  files=100
  [common]
  files=20

---

code:

---

  [common]
  files=200
  [common]
  files=20

---

Greetings.

btw: the default config.nt doesn't have a section [common declared,
because it is optional and not required.