How to take Dx9 out of .img ?

[surferpop]

I just bought Impossible Creatures and it requires the installation of dx9.The demo works on 8.1...it appears this is Bills' way of spreading the joy.I don't believe dx9 is really needed to run this game and I hesitate to upgrade as in the past, dx upgrades have screwed up my installed games and required mass reinstalls and formats.My question is:

How can I copy the game to an image file and then edit it to
delete the dx9 setup folder?
Any other ideas?
Thanks