Texture scale change with use of save as, or export


I have used Rhino from v 1. We use 3D printing in house. I have problem with export texture, UVW are set to 13 to get the right scale of bricks, and with rendring it is right. But when using save as or export as ply, wrml or zpr, the scale is lost and the bricks seem to be in scale 1:1.