But I ve got a problem. I used to play with some nice grf's. Some of them are not working with OpenTTD. When I starting the game it shows me message that my grf has got an invalid format or something.
Now... I want to use New Water graphics in OpenTTD. Is there any way to recompile that grf so it will be compatible with OpanTTD? I was thinking about merge this grf file with trg1r.grf and I think it may work as well.
But I dont know how to do this. Can anyone help me?

I will put this grf here so if someone know how to make it useable in OpenTTD I would be very thankful.