addtopath function doesnt add all_users

[jweinraub]

I made a booboo on my last installer than overwrote the allusers path so i need to make a patch for my future installer. so i only want to add it to the path if it isn't in there, that way it wont add multiple strings of it.

i want to add it to: HKEY_LOCAL_MACHINE "SYSTEM\CurrentControlSet\Control\Session Manager\Environment" "Path"

in the beginning of the code i do this:

!define ALL_USERS

!include "WinMessages.NSH"
!include "AddToPath.nsh"


later on i do this:

Push "%SystemRoot%\System32\WBEM"
Call AddToPath

it doesn't add it into the environment variables.

what am i doing wrong?
would this check automatically if it isnt in the path already or do i need to use StrStr to search?

thanks

also when the program gets uninstalled i still want to keep the path change present as i overwrote a system path that is required by winders.