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_ShellExecuteWithReducedPrivileges

An odd thing about Vista+ O/S's is that, once you run a process in elevated privileges mode, you can't run other processes in lower-privileged modes.

Why, you ask, would that be important?

Sometimes you want - or need - to limit the privileges of a process:

  • A very common scenario for me is drag-and-drop.

    Windows' Explorer does NOT allow this to occur between lower privileged processes (like Explorer itself!) and other processes. This is very frustrating for users in programs that take advantage of that.

  • There's also some problems using certain SendMessage commands from other unelevated processes.
  • Setting the state or properties of windows that have an elevated privilege may not work either from other unelevated processes.
  • An install or setup program that needs to launch the installed program will more often than not want to run that program on a lower privilege level (for some of the reasons mentioned above)
So, after some looking around I found two ways of running processes under a lower privilege mode. One is using CreateProcessWithTokenW (see ), and the other is using COM objects - specifically Windows Explorer's SHELL object to ShellExecute a command/program. This can be used just like AutoIt's built-in ShellExecute() function, but of course the program that runs will be at a reduced IL (integrity level).

The code is based on Brandon @ BrandonLive's article here:

'Getting the shell to run an application for you - Part 2:How | BrandonLive'

The usage is straightforward for this one: use it like ShellExecute. The $bWait parameter is only there in case ShellExecuteWait() will be called for either non-elevated processes or pre-Vista O/S's. Example:

_ShellExecuteWithReducedPrivileges(@ComSpec,' /k title Non-Elevated prompt (via Shell.ShellExecute)')

Anyway, hope this helps someone out!

Ascend4nt's AutoIT Code License agreement:

While I provide this source code freely, if you do use the code in your projects, all I ask is that:

  • If you provide source, keep the header as I have put it, OR, if you expand it, then at least acknowledge me as the original author, and any other authors I credit
  • If the program is released, acknowledge me in your credits (it doesn't have to state which functions came from me, though again if the source is provided - see #1)
  • The source on it's own (as opposed to part of a project) can not be posted unless a link to the page(s) where the code were retrieved from is provided and a message stating that the latest updates will be available on the page(s) linked to.
  • Pieces of the code can however be discussed on the threads where Ascend4nt has posted the code without worrying about further linking.

Download the ZIP from my Site

Edited by Ascend4nt

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