Excuse me
how convert a bld files in bmp files?
I have found on those adresse http://tosebro.s21.xrea.com/ujimon/materials/buildings.html
As I though, you can't.
BLD is a 3D file.
http://filext.com/file-extension/BLD
Edit: I looked again the website, and now I found why this BLD file looked familiar, it's a file from SimCity 3000.
You can open it with an editor that came with the game, if I'm not wrong.