Slow ".exe" calling from a shared program folder in a non-Vista machine

[fpsoft]

Scenario:

- A machine (xp pro, 2000 pro) that has a simple "test.exe" vb6 program (it
doesn't do anything, contains only a form) in the "program files" folder
(shared) and in the "foo" folder (another folder, shared too).

The two network paths are:
\\server\program files\test.exe and \\server\foo\test.exe

- A machine with Vista Business. If on this machine i go in "Start / Run"
and call "\\server\program files\test.exe", then i must wait 13 seconds
before the "test.exe" form appears. If i call "test.exe" using
\\server\foo\test.exe (note that it points to another folder) then the
calling is immediate.

I know that Vista makes some special treatment for the "Program files"
folder, but also on "Program files" folder residents on other non-Vista
machines?

 

[fpsoft]

Scenario:

- A machine (xp pro, 2000 pro) that has a simple "test.exe" vb6 program
(it doesn't do anything, contains only a form) in the "program files"
folder (shared) and in the "foo" folder (another folder, shared too).

The two network paths are:
\\server\program files\test.exe and \\server\foo\test.exe

- A machine with Vista Business. If on this machine i go in "Start / Run"
and call "\\server\program files\test.exe", then i must wait 13 seconds
before the "test.exe" form appears. If i call "test.exe" using
\\server\foo\test.exe (note that it points to another folder) then the
calling is immediate.

I know that Vista makes some special treatment for the "Program files"
folder, but also on "Program files" folder residents on other non-Vista
machines?

I want to add that the operating systems are in Italian.