32bpp bitmaps

[Kevin Koltzau]

I am loading a 32bpp bitmap from resources of a dll, but under wine its being reported as 24 bit..for example

void main() {
    HMODULE hTheme = LoadLibrary("C:\Windows\Resources\Themes\Luna\Luna.msstyles");
    HBITMAP hBmp = LoadBitmap(hTheme, "BLUE_BUTTON_BMP");
    BITMAP bmp;
    GetObject(hBmp, sizeof(bmp), &bmp);
    printf("bpp=%d\n", bmp.bmBitsPizel);
}

under Windows prints 32, under Wine prints 24
I've tried to find the cause of this, but much of this is deep in x11drv which I am not familliar with at all..
Is wine stripping the alpha channel for some reason? or is this a bug?
(I've only run this example on that one file, its the native Luna.msstyles theme from an XP system)