If you want to change it then you must code it at the end of you main.c file. Here is the syntax for it: http://www.conitec.net/beta/aWINSTART.htm After this you must publish your project and check the option "Starter" to use your start window instead of the default one.
sorry i've tried to do this but does not seems to work the engine says WINDOW undeclared identifier, in the guide there is only one way to script this and it seems c-script it talks only about wdl files not c files. can you answer me please?
Yes it's for wdl. You should create a wdl file with the same name as your main script and write only your "WINDOW" code in it. if your main script named like "main.c" you can create "main.wdl" and 3DGS knows to look into it while publishing.
The last time i tried it was at the begining of A7. But it should work right now.