Installer enabling DSP plugins for Single User and Multi User Installations

Does anyone have a script for detecting whether Winamp is installed in a single-user or multi-user configuration?

I have an old installer that enables a Winamp DSP plugin by writing to "Winamp.ini"

WriteINIStr "$4\Winamp.ini" "Winamp" "dspplugin_name" "dsp_MY_PLUGIN.dll"

However, Winamp can now be installed in multi-user setup, so "Winamp.ini" can actually be in the user's "Documents and Settings" folder, not in "Program Files/Winamp". Now my installer modifies wrong "Winamp.ini" and does not enable the plugin. How can I enable the plugin whether the Winamp installation is single or multi-user?

Thanks,

Zoran

check (for) paths.ini first maybe

After tinkering with NSIS, here is th solution to an installer that enables/activates a Winamp DSP plugin in both machine-wide and multi-user Winamp installations.

• The installer looks for Winamp.ini (computer-wide Winamp installation).
  Failing that it looks for Paths.ini.
  Then it reads Paths.ini for determine the location of user-specific Winamp.ini.
  Finally, it updates Winamp.ini to activate the DSP plugin.

Laza