addtopath function doesnt add all_users

[jweinraub]

well i got around it doing it like this and it seems to work.

ReadRegStr $1 HKLM \
"SYSTEM\CurrentControlSet\Control\Session Manager\Environment" Path
Push $1
Push "wbem"
Call StrStr
Pop $R0

StrCmp $R0 "" true false

true:
; the item isnt here so add it now
Push "$sysdir\wbem"
Call AddToPath
Goto End

false:
;nothing to do today, hurray!
Goto End