Problem with Virtualization/LUA

[Sandeep]

Hi,
I've an executable which displays/edits some user specific settings and do
some changes in %programfiles% folder as well.
XP:
It works fine 'coz you can change the user specific settings (stored in the
HKCU registry). And if it tries to access %programfiles% it fails(Shows an
error message) if the current user is non-admin and work fine if it is an
admin. All well
Vista:
Application works fine with user settings but when try to modify the
%programfiles% folder it creates a new file in the virtual store and never
throws an exception.
Everything works fine except the fact that we've hard links to this file in
the %programfiles% folder which are used by other applications. Now even
though my application works correctly other apps trying to use the hardlinks
can't see the changes because contents of %programfiles% file has not
changed.

What is the solution to this problem?

Some more question that can solve my problem
1) Is it possible for an application to specify if a particular operation
can be executed with elevated privilege only? Not the whole executable but
just some methods.

2)How can I disable virtualization for my process? (can I use manifest file
for this purpose?)

3)Can I determine at the runtime if I'm running with the elevated
privileges?
Will it return false
((WindowsPrincipal)Thread.CurrentPrincipal).IsInRo le(WindowsBuiltInRole.Administrator))
if I'm running app without elevated privilege and true if running with
elevated privileges.

Regards
Sandeep