Howto set raster draping on in 1.000 files?

Hi all

I have around 1.000 dgn files with one raster files attached to each file.

How can I set the raster property "draping" to be on in every file?

I searched for a keyin but no luck. So I could use it in a simple batch process.

Do I really have to write a vba script?

Kind regards

Morten