Recommend how to use .spl files from "CAD Star"
You probably need to generate Gerber files for that. I've never worked in program of yours, but they all usually have gerber generator. Google &quot;cad star gerber&quot; or something like that to find how to do that. For example, eagle generates .pcb and .sch for board and schematic, but it's not what you send the manufacturer. You need to generate gerber files, they're supported by everyone, although there may be some manufacturer-specific issues and/or rules regarding those. Usually you just send the gerber and if something doesn't fit in your gerber, the manufacturer replies and asks to correct this or that, at least that happened to me.