#ifdef in .rc2 file in release version does not work!

Hi,
I'm defining IDR_MAINFRAME and AFX_IDS_APP_TITLE in my .rc2 file depending enviornment variable. (its in .rc2 because in .rc file Microsoft does not accept #ifdef).

In debug version it works great but in release version it doesn't work. It seems that definitions are not recognized in release version at all.

Here is the code from .rc2 file:
#if defined FIRST
STRINGTABLE DISCARDABLE
BEGIN
IDR_MAINFRAME "First Console\n\nFirst\nFirst Files (*.frs)\n.frs\nFirst.Document\nFirst File"
AFX_IDS_APP_TITLE "First Console"
END
#elif defined SECOND
STRINGTABLE DISCARDABLE
BEGIN
IDR_MAINFRAME "Second Console\n\nSecond\nSecond Files (*.frs)\n.frs\nFirst.Document\nFirst File"
AFX_IDS_APP_TITLE "First Console"
END
#endif

It is quite urgent. Does anyone has an idea why in release version it doesn't work?

O.K.
It seems that I know the reason why.
We need to add the enviornemnt variable to the preprocessor definitions in the resource tab in project settins (and not only in the c/c++ tab, general in combo box int the project settings).
I only put it for the debug version.

But I have another question. While searching for differences between debug and release in the project settings I found that my release version does use precompiled header and the debug version does not.
Is there a reason why not using precompiled header (stdafx.h)? is there a reason why in debug we will not use it and in release we will?

Probably the reason is because someone changed it. When the project is created, all configurations are set up the same way with regards to precompiled headers.