FS9 grass textures locations ?

I'd be grateful if someone will tell where the grass textures that produce the grass we see as we fly about are kept. I want to make my FS2004 as green as my FSGW3 is.
I put the detail1.bmp from GW3 into FS9 & it makes a great improcement.

I got Digital Image Tool 3.2 but, eg, the 4 r8 files I have end up as small grey .jpg squares named grass regardless of what they started as.
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I've attached what the textures look like in Image Tool. Obviously FS9 takes that image and modifies it to look like the seasonal grass that you see in the game. Creating a custom grass texture may be the best way to go.