D2G macro - how to insert an image (bmp)?

I'm trying to use a macro to pull an image into my rtf title page. I've created a macro, and d2g processes it. But instead of creating an INCLUDEPICTURE field, such as:
{ INCLUDEPICTURE"sSLogo.bmp" \* MERGEFORMAT\d \x \y}

it simply inserts the field code contents as text on the page:

INCLUDEPICTURE"sSLogo.bmp" MERGEFORMAT

I've tried a couple of variants, they both get the same result:

[sSLogo]
{ INCLUDEPICTURE"sSLogo.bmp" \* MERGEFORMAT\d \x \y}
and:
[sSLogo]
{\field{ INCLUDEPICTURE"sSLogo.bmp" \* MERGEFORMAT\d \x \y}}

I haven't been able to find anything in the rtf world to help me do this, so any help is appreciated.